Why it’s so hard to bust the weather control conspiracy theory

It was October 2024, and Hurricane Helene had just devastated the US Southeast. Representative Marjorie Taylor Greene of Georgia found an abstract target on which to pin the blame: “Yes they can control the weather,” she posted on X. “It’s ridiculous for anyone to lie and say it can’t be done.” 

There was no word on who “they” were, but maybe it was better that way. 

She was repeating what’s by now a pretty familiar and popular conspiracy theory: that shadowy forces are out there, wielding unknown technology to control the weather and wreak havoc on their supposed enemies. This claim, fundamentally preposterous from a scientific standpoint, has grown louder and more common in recent years. It pops up over and over when extreme weather strikes: in Dubai in April 2024, in Australia in July 2022, in the US after California floods and hurricanes like Helene and Milton. In the UK, conspiracy theorists claimed that the government had fixed the weather to be sunny and rain-free during the first covid lockdown in March 2020. Most recently, the theories spread again when disastrous floods hit central Texas this past July. The idea has even inspired some antigovernment extremists to threaten and try to destroy weather radar towers. 


This story is part of MIT Technology Review’s series “The New Conspiracy Age,” on how the present boom in conspiracy theories is reshaping science and technology.


But here’s the thing: While Greene and other believers are not correct, this conspiracy theory—like so many others—holds a kernel of much more modest truth behind the grandiose claims. 

Sure, there is no current way for humans to control the weather. We can’t cause major floods or redirect hurricanes or other powerful storm systems, simply because the energy involved is far too great for humans to alter significantly. 

But there are ways we can modify the weather. The key difference is the scale of what is possible. 

The most common weather modification practice is called cloud seeding, and it involves injecting small amounts of salts or other materials into clouds with the goal of juicing levels of rain or snow. This is typically done in dry areas that lack regular precipitation. Research shows that it can in fact work, though advances in technology reveal that its impact is modest—coaxing maybe 5% to 10% more moisture out of otherwise stubborn clouds.

But the fact that humans can influence weather at all gives conspiracy theorists a foothold in the truth. Add to this a spotty history of actual efforts by governments and militaries to control major storms, as well as other emerging but not-yet-deployed-at-any-scale technologies that aim to address climate change … and you can see where things get confusing. 

So while more sweeping claims of weather control are ultimately ridiculous from a scientific standpoint, they can’t be dismissed as entirely stupid.

This all helped make the conspiracy theories swirling after the recent Texas floods particularly loud and powerful. Just days earlier, 100 miles away from the epicenter of the floods, in a town called Runge, the cloud-seeding company Rainmaker had flown a single-engine plane and released about 70 grams of silver iodide into some clouds; a modest drizzle of less than half a centimeter of rain followed. But once the company saw a storm front in the forecast, it suspended its work; there was no need to seed with rain already on the way.

“We conducted an operation on July 2, totally within the scope of what we were regulatorily permitted to do,” Augustus Doricko, Rainmaker’s founder and CEO, recently told me. Still, when as much as 20 inches of rain fell soon afterward not too far away, and more than 100 people died, the conspiracy theory machine whirred into action. 

As Doricko told the Washington Post in the tragedy’s aftermath, he and his company faced “nonstop pandemonium” on social media; eventually someone even posted photos from outside Rainmaker’s office, along with its address. Doricko told me a few factors played into the pile-on, including a lack of familiarity with the specifics of cloud seeding, as well as what he called “deliberately inflammatory messaging from politicians.” Indeed, theories about Rainmaker and cloud seeding spread online via prominent figures including Greene and former national security advisor Mike Flynn

Unfortunately, all this is happening at the same time as the warming climate is making heavy rainfall and the floods that accompany it more and more likely. “These events will become more frequent,” says Emily Yeh, a professor of geography at the University of Colorado who has examined approaches and reactions to weather modification around the world. “There is a large, vocal group of people who are willing to believe anything but climate change as the reason for Texas floods, or hurricanes.”

Worsening extremes, increasing weather modification activity, improving technology, a sometimes shady track record—the conditions are perfect for an otherwise niche conspiracy theory to spread to anyone desperate for tidy explanations of increasingly disastrous events.

Here, we break down just what’s possible and what isn’t—and address some of the more colorful reasons why people may believe things that go far beyond the facts. 

What we can do with the weather—and who is doing it

The basic concepts behind cloud seeding have been around for about 80 years, and government interest in the topic goes back even longer than that

The primary practice involves using planes, drones, or generators on the ground to inject tiny particles of stuff, usually silver iodide, into existing clouds. The particles act as nuclei around which moisture can build up, forming ice crystals that can get heavy enough to fall out of the cloud as snow or rain.

“Weather modification is an old field; starting in the 1940s there was a lot of excitement,” says David Delene, a research professor of atmospheric sciences at the University of North Dakota and an expert on cloud seeding. In a US Senate report from 1952 to establish a committee to study weather modification, authors noted that a small amount of extra rain could “produce electric power worth hundreds of thousands of dollars” and “greatly increase crop yields.” It also cited potential uses like “reducing soil erosion,” “breaking up hurricanes,” and even “cutting holes in clouds so that aircraft can operate.” 

But, as Delene adds, “that excitement … was not realized.”

Through the 1980s, extensive research often funded or conducted by Washington yielded a much better understanding of atmospheric science and cloud physics, though it proved extremely difficult to actually demonstrate the efficacy of the technology itself. In other words, scientists learned the basic principles behind cloud seeding, and understood on a theoretical level that it should work—but it was hard to tell how big an impact it was having on rainfall.

There is huge variability between one cloud and another, one storm system and another, one mountain or valley and another; for decades, the tools available to researchers did not really allow for firm conclusions on exactly how much extra moisture, if any, they were getting out of any given operation. Interest in the practice died down to a low hum by the 1990s.

But over the past couple of decades, the early excitement has returned.

Cloud seeding can enhance levels of rain and snow 

While the core technology has largely stayed the same, several projects launched in the US and abroad starting in the 2000s have combined statistical modeling with new and improved aircraft-based measurements, ground-based radar, and more to provide better answers on what results are actually achievable when seeding clouds.

“I think we’ve identified unequivocally that we can indeed modify the cloud,” says Jeff French, an associate professor and head of the University of Wyoming’s Department of Atmospheric Science, who has worked for years on the topic. But even as scientists have come to largely agree that the practice can have an impact on precipitation, they also largely recognize that the impact probably has some fairly modest upper limits—far short of massive water surges. 

“There is absolutely no evidence that cloud seeding can modify a cloud to the extent that would be needed to cause a flood,” French says. Floods require a few factors, he adds—a system with plenty of moisture available that stays localized to a certain spot for an extended period. “All of these things which cloud seeding has zero effect on,” he says. 

The technology simply operates on a different level. “Cloud seeding really is looking at making an inefficient system a little bit more efficient,” French says. 

As Delene puts it: “Originally [researchers] thought, well, we could, you know, do 50%, 100% increases in precipitation,” but “I think if you do a good program you’re not going to get more than a 10% increase.” 

Asked for his take on a theoretical limit, French was hesitant—“I don’t know if I’m ready to stick my neck out”—but agreed on “maybe 10-ish percent” as a reasonable guess.

Another cloud seeding expert, Katja Friedrich from the University of Colorado–Boulder, says that any grander potential would be obvious by this point: We wouldn’t have “spent the last 100 years debating—within the scientific community—if cloud seeding works,” she writes in an email. “It would have been easy to separate the signal (from cloud seeding) from the noise (natural precipitation).”

It can also (probably) suppress precipitation

Sometimes cloud seeding is used not to boost rain and snow but rather to try to reduce its severity—or, more specifically, to change the size of individual rain droplets or hailstones. 

One of the most prominent examples has been in parts of Canada, where hailstorms can be devastating; a 2024 event in Calgary, for instance, was the country’s second-most-expensive disaster ever, with over $2 billion in damages. 

Insurance companies in Alberta have been working together for nearly three decades on a cloud seeding program that’s aimed at reducing some of that damage. In these cases, the silver iodide or other particles are meant to act essentially as competition for other “embryos” inside the cloud, increasing the total number of hailstones and thus reducing each individual stone’s average size. 

Smaller hailstones means less damage when they reach the ground. The insurance companies—which continue to pay for the program—say losses have been cut by 50% since the program started, though scientists aren’t quite as confident in its overall success. A 2023 study published in Atmospheric Research examined 10 years of cloud seeding efforts in the province and found that the practice did appear to reduce potential for damage in about 60% of seeded storms—while in others, it had no effect or was even associated with increased hail (though the authors said this could have been due to natural variation).

Similar techniques are also sometimes deployed to try to improve the daily forecast just a bit. During the 2008 Olympics, for instance, China engaged in a form of cloud seeding aimed at reducing rainfall. As MIT Technology Review detailed back then, officials with the Beijing Weather Modification Office planned to use a liquid-nitrogen-based coolant that could increase the number of water droplets in a cloud while reducing their size; this can get droplets to stay aloft a little longer instead of falling out of the cloud. Though it is tough to prove that it definitively would have rained without the effort, the targeted opening ceremony did stay dry.

So, where is this happening? 

The United Nations’ World Meteorological Organization says that some form of weather modification is taking place in “more than 50 countries” and that “demand for these weather modification activities is increasing steadily due to the incidence of droughts and other calamities.”

The biggest user of cloud-seeding tech is arguably China. Following the work around the Olympics, the country announced a huge expansion of its weather modification program in 2020, claiming it would eventually run operations for agricultural relief and other functions, including hail suppression, over an area about the size of India and Algeria combined. Since then, China has occasionally announced bits of progress—including updates to weather modification aircraft and the first use of drones for artificial snow enhancement. Overall, it spends billions on the practice, with more to come.

Elsewhere, desert countries have taken an interest. In 2024, Saudi Arabia announced an expanded research program on cloud seeding—Delene, of the University of North Dakota, was part of a team that conducted experiments in various parts of that country in late 2023. Its neighbor the United Arab Emirates began “rain enhancement” activities back in 1990; this program too has faced outcry, especially after more than a typical year’s worth of rain fell in a single day in 2024, causing massive flooding. (Bloomberg recently published a story about persistent questions regarding the country’s cloud seeding program; in response to the story, French wrote in an email that the “best scientific understanding is still that cloud seeding CANNOT lead to these types of events.” Other experts we asked agreed.) 

In the US, a 2024 Government Accountability Office report on cloud seeding said that at least nine states have active programs. These are sometimes run directly by the state and sometimes contracted out through nonprofits like the South Texas Weather Modification Association to private companies, including Doricko’s Rainmaker and North Dakota–based Weather Modification. In August, Doricko told me that Rainmaker had grown to 76 employees since it launched in 2023. It now runs cloud seeding operations in Utah, Idaho, Oregon, California, and Texas, as well as forecasting services in New Mexico and Arizona. And in an answer that may further fuel the conspiracy fire, he added they are also operating in one Middle Eastern country; when I asked which one, he’d only say, “Can’t tell you.”

What we cannot do

The versions of weather modification that the conspiracy theorists envision most often—significantly altering monsoons or hurricanes or making the skies clear and sunny for weeks at a time—have so far proved impossible to carry out. But that’s not necessarily for lack of trying.

The US government attempted to alter a hurricane in 1947 as part of a program dubbed Project Cirrus. In collaboration with GE, government scientists seeded clouds with pellets of dry ice, the idea being that the falling pellets could induce supercooled liquid in the clouds to crystallize into ice. After they did this, the storm took a sharp left turn and struck the area around Savannah, Georgia. This was a significant moment for budding conspiracy theories, since a GE scientist who had been working with the government said he was “99% sure” the cyclone swerved because of their work. Other experts disagreed and showed that such storm trajectories are, in reality, perfectly possible without intervention. Perhaps unsurprisingly, public outrage and threats of lawsuits followed.

It took some time for the hubbub to die down, after which several US government agencies continued—unsuccessfully—trying to alter and weaken hurricanes with a long-running cloud seeding program called Project Stormfury. Around the same time, the US military joined the fray with Operation Popeye, essentially trying to harness weather as a weapon in the Vietnam War—engaging in cloud seeding efforts over Vietnam, Cambodia, and Laos in the late 1960s and early 1970s, with an eye toward increasing monsoon rains and bogging down the enemy. Though it was never really clear whether these efforts worked, the Nixon administration tried to deny them, going so far as to lie to the public and even to congressional committees.

More recently and less menacingly, there have been experiments with Dyn-O-Gel—a Florida company’s super-absorbent powder, intended to be dropped into storm clouds to sop up their moisture. In the early 2000s, the company carried out experiments with the stuff in thunderstorms, and it had grand plans to use it to weaken tropical cyclones. But according to one former NOAA scientist, you would need to drop almost 38,000 tons of it, requiring nearly 380 individual plane trips, in and around even a relatively small cyclone’s eyewall to really affect the storm’s strength. And then you would have to do that again an hour and a half later, and so on. Reality tends to get in the way of the biggest weather modification ideas.

Beyond trying to control storms, there are some other potential weather modification technologies out there that are either just getting started or have never taken off. Swiss researchers have tried to use powerful lasers to induce cloud formation, for example; in Australia, where climate change is imperiling the Great Barrier Reef, artificial clouds created when ship-based nozzles spray moisture into the sky have been used to try to protect the vital ecosystem. In each case, the efforts remain small, localized, and not remotely close to achieving the kinds of control the conspiracy theorists allege.

What is not weather modification—but gets lumped in with it

Further worsening weather control conspiracies is that there is a tendency to conflate cloud seeding and other promising weather modification research with concepts such as chemtrails—a full-on conspiracist fever dream about innocuous condensation trails left by jets—and solar geoengineering, a theoretical stopgap to cool the planet that has been subject to much discussion and modeling research but has never been deployed in any large-scale way.

One controversial form of solar geoengineering, known as stratospheric aerosol injection, would involve having high-altitude jets drop tiny aerosol particles—sulfur dioxide, most likely—into the stratosphere to act essentially as tiny mirrors. They would reflect a small amount of sunlight back into space, leaving less energy to reach the ground and contribute to warming. To date, attempts to launch physical experiments in this space have been shouted down, and only tiny—though still controversial—commercial efforts have taken place. 

One can see why it gets lumped in with cloud seeding: bits of stuff, dumped into the sky, with the aim of altering what happens down below. But the aims are entirely separate; geoengineering would alter the global average temperature rather than having measurable effects on momentary cloudbursts or hailstorms. Some research has suggested that the practice could alter monsoon patterns, a significant issue given their importance to much of the world’s agriculture, but it remains a fundamentally different practice from cloud seeding.

Still, the political conversation around supposed weather control often reflects this confusion. Greene, for instance, introduced a bill in July called the Clear Skies Act, which would ban all weather modification and geoengineering activities. (Greene’s congressional office did not respond to a request for comment.) And last year, Tennessee became the first state to enact a law to prohibit the “intentional injection, release, or dispersion, by any means, of chemicals, chemical compounds, substances, or apparatus … into the atmosphere with the express purpose of affecting temperature, weather, or the intensity of the sunlight.” Florida followed suit, with Governor Ron DeSantis signing SB 56 into law in June of this year for the same stated purpose.

Also this year, lawmakers in more than 20 other states have also proposed some version of a ban on weather modification, often lumping it in with geoengineering, even though caution on the latter is more widely accepted or endorsed. “It’s not a conspiracy theory,” one Pennsylvania lawmaker who cosponsored a similar bill told NBC News. “All you have to do is look up.”

Oddly enough, as Yeh of the University of Colorado points out, the places where bans have passed are states where weather modification isn’t really happening. “In a way, it’s easy for them to ban it, because, you know, nothing actually has to be done,” she says. In general, neither Florida nor Tennessee—nor any other part of the Southeast—needs any help finding rain. Basically, all weather modification activity in the US happens in the drier areas west of the Mississippi. 

Finding a culprit

Doricko told me that in the wake of the Texas disaster, he has seen more people become willing to learn about the true capabilities of cloud seeding and move past the more sinister theories about it. 

I asked him, though, about some of his company’s flashier branding: Until recently, visitors to the Rainmaker website were greeted right up top with the slogan “Making Earth Habitable.” Might this level of hype contribute to public misunderstanding or fear? 

He said he is indeed aware that Earth is, currently, habitable, and called the slogan a “tongue-in-cheek, deliberately provocative statement.” Still, in contrast to the academics who seem more comfortable acknowledging weather modification’s limits, he has continued to tout its revolutionary potential. “If we don’t produce more water, then a lot of the Earth will become less habitable,” he said. “By producing more water via cloud seeding, we’re helping to conserve the ecosystems that do currently exist, that are at risk of collapse.” 

While other experts cited that 10% figure as a likely upper limit of cloud seeding’s effectiveness, Doricko said they could eventually approach 20%, though that might be years away. “Is it literally magic? Like, can I snap my fingers and turn the Sahara green? No,” he said. “But can it help make a greener, verdant, and abundant world? Yeah, absolutely.” 

It’s not all that hard to see why people still cling to magical thinking here. The changing climate is, after all, offering up what’s essentially weaponized weather, only with a much broader and long-term mechanism behind it. There is no single sinister agency or company with its finger on the trigger, though it can be tempting to look for one; rather, we just have an atmosphere capable of holding more moisture and dropping it onto ill-prepared communities, and many of the people in power are doing little to mitigate the impacts.

“Governments are not doing a good job of responding to the climate crisis; they are often captured by fossil-fuel interests, which drive policy, and they can be slow and ineffective when responding to disasters,” Naomi Smith, a lecturer in sociology at the University of the Sunshine Coast in Australia who has written about conspiracy theories and weather events, writes in an email. “It’s hard to hold all this complexity, and conspiracy theorizing is one way of making it intelligible and understandable.”  

“Conspiracy theories give us a ‘big bad’ to point the finger at, someone to blame and a place to put our feelings of anger, despair, and grief,” she writes. “It’s much less satisfying to yell at the weather, or to engage in the sustained collective action we actually need to tackle climate change.”

The sinister “they” in Greene’s accusations is, in other words, a far easier target than the real culprit. 

Dave Levitan is an independent journalist, focused on science, politics, and policy. Find his work at davelevitan.com and subscribe to his newsletter at gravityisgone.com

What it’s like to be in the middle of a conspiracy theory (according to a conspiracy theory expert)

On a gloomy Saturday morning this past May, a few months after entire blocks of Altadena, California, were destroyed by wildfires, several dozen survivors met at a local church to vent their built-up frustration, anger, blame, and anguish. As I sat there listening to one horror story after another, I almost felt sorry for the very polite consultants who were being paid to sit there, and who couldn’t do a thing about what they were hearing.

Hosted by a third-party arbiter at the behest of Los Angeles County, the gathering was a listening session in which survivors could “share their experiences with emergency alerts and evacuations” for a report on how the response to the Eaton Fire months earlier had succeeded and failed. 

It didn’t take long to see just how much failure there had been.


This story is part of MIT Technology Review’s series “The New Conspiracy Age,” on how the present boom in conspiracy theories is reshaping science and technology.


After a small fire started in the bone-dry brush of Pasadena’s Eaton Canyon early in the evening of Tuesday, January 7, 2025, the raging Santa Ana winds blew its embers into nearby Altadena, the historically Black and middle-class town just to the north. By Wednesday morning, much of it was burning. Its residents spent the night making frantic, desperate scrambles to grab whatever they could and get to safety. 

In the aftermath, many claimed that they received no warning to evacuate, saw no first responders battling the blazes, and had little interaction with official personnel. Most were simply left to fend for themselves. 

Making matters worse, while no place is “good” for a wildfire, Altadena was especially vulnerable. It was densely packed with 100-year-old wooden homes, many of which were decades behind on the code upgrades that would have better protected them. It was full of trees and other plants that had dried out during the rain-free winter. Few residents or officials were prepared for the seemingly remote possibility that the fires that often broke out in the mountains nearby would jump into town. As a result, resources were strained to the breaking point, and many homes simply burned freely.

So the people packed into the room that morning had a lot to be angry about. They unloaded their own personal ordeals, the traumas their community had experienced, and even catastrophes they’d heard about secondhand. Each was like a dagger to the heart, met with head-nods and “uh-huhs” from people all going through the same thing.

LA County left us to die because we couldn’t get alerts!

I’m sleeping in my car because I was a renter and have no insurance coverage!

Millions of dollars in aid were raised for us, and we haven’t gotten anything!

Developers are buying up Altadena and pricing out the Black families who made this place!

The firefighting planes were grounded on purpose by Joe Biden so he could fly around LA!

One of these things was definitely not like the others. And I knew why.

Two trains collide

It’s something of a familiar cycle by now: Tragedy hits; rampant misinformation and conspiracy theories follow. Think of the deluge of “false flag” and “staged gun grab” conspiracy theories after mass shootings, or the rampant disinformation around covid-19 and the 2020 election. It’s often even more acute in the case of a natural disaster, when conspiracy theories about what “really” caused the calamity run right into culture-war-driven climate change denialism. Put together, these theories obscure real causes while elevating fake ones, with both sides battling it out on social media and TV. 

I’ve studied these ideas extensively, having spent the last 10 years writing about conspiracy theories and disinformation as a journalist and researcher. I’ve covered everything from the rise of QAnon to whether Donald Trump faked his assassination attempt to the alarming rises in antisemitism, antivaccine conspiracism, and obsession with human trafficking. I’ve written three books, testified to Congress, and even written a report for the January 6th Committee. So this has been my life for quite a while. 

Still, I’d never lived it. Not until the Eaton Fire.

For a long time, I’d been able to talk about the conspiracy theories without letting them in. Now the disinformation was in the room with me, and it was about my life.

My house, a cottage built in 1925, was one of those that burned back in January. Our only official notification to flee had come at 3:25 a.m., nine hours after the fires started. We grabbed what we could in 10 minutes, I locked our front door, and six hours later, it was all gone. We could have died. Eighteen Altadena residents did die—and all but one were in the area that was warned too late.

Previously in my professional life, I’d always been able to look at the survivors of a tragedy, crying on TV about how they’d lost everything, and think sympathetically but distantly, Oh, those poor people. And soon enough, the conspiracy theories I was following about the incident for work would die down, and then it was no longer in my official purview—I could move on to the next disaster and whatever mess came with it. 

Now I was one of those poor people. The Eaton Fire had changed everything about my life. Would it change everything about my work as well? It felt as though two trains I’d managed to keep on parallel tracks had collided.

For a long time, I’d been able to talk about the conspiracy theories without letting them in. Now the disinformation was in the room with me, and it was about my life. And I wondered: Did I have a duty to journalism to push back on the wild thinking—or on this particular idea that Biden was responsible? 

Or did I have a duty to myself and my sanity to just stay quiet?

Just true enough

In the days following the Eaton Fire, which coincided with another devastating fire in Los Angeles’ Pacific Palisades neighborhood, the Biden plane storyline was just one of countless rumors, false claims, hoaxes, and accusations about what had happened and who was behind them.

Most were culture-war nonsense or political fodder. I also saw clearly fake AI slop (no, the Hollywood sign was not on fire) and bits of TikTok ephemera that could largely be ignored. 

They were from something like an alternate world, one where forest floors hadn’t been “raked” and where incompetent “DEI firefighters” let houses burn while water waited in a giant spigot that California’s governor, Gavin Newsom, refused to “turn on” because he preferred to protect an endangered fish. There were claims that the fires were set on purpose to clear land for the Olympics, or to cover up evidence of human trafficking. Rumors flew that LA had donated all its firefighting money and gear to Ukraine. Some speculated that the fires were started by undocumented immigrants (one was suspected of causing one of the fires but never charged) or “antifa” or Black Lives Matter activists—never mind that one of the most demographically Black areas in the city was wiped out. Or, as always, it was the Jews. In this case, blame fell on a “wealthy Jewish couple” who supposedly owned most of LA’s water and wouldn’t let it go.

These claims originated from the same “just asking questions” influencers who run the same playbook for every disaster. And they spread rapidly through X, a platform where breaking news had been drowned out by hysterical conspiracism. 

But many did have elements of truth to them, surrounded by layers of lies and accusations. A few were just true enough to be impossible to dismiss out of hand, but also not actually true.

So, for the record: Biden did not ground firefighting aircraft in Los Angeles. 

According to fact-checking by both USA Today and Reuters, Biden flew into Los Angeles the day before the Eaton Fire broke out (which was also the same day that the Palisades Fire started, roughly 30 miles to the west), to dedicate two new national monuments. He left two days later. And while there were security measures in place, including flight restrictions over the area where he was staying, firefighting planes simply had to coordinate with air traffic controllers to cross into the closed-off space. 

But when my sort-of neighbor brought up this particular theory that day in May, I wasn’t able to debunk it. For one thing, this was my first time hearing the rumor. But more than that, what could I say that would assuage this man’s anger? And if he wanted to blame Biden for his house burning down, was it really my place to tell him he was wrong—even if he was? 

It’s common for survivors of a disaster to be aware of only parts of the story, struggle to understand the full picture, or fail to fully recollect what happened to them in the moment of survival. Once the trauma ebbs, we’re left looking for answers and clarity and someone who knows what’s going on, because we certainly don’t have a clue. Hoaxes and misinformation stem from anger, confusion, and a lack of clear answers to rapidly evolving questions.  

I can confirm that it was dizzying. Rumors and hoaxes were going around in my personal circles too, even if they weren’t so lurid and even if we didn’t really believe them. Bits of half-heard news circulated constantly in our group texts, WhatsApp chains, Facebook groups, and in-person gatherings. 

There was confusion over who was responsible for the extent of the devastation, genuine anger about purported LA Fire Department budget cuts (though those had not actually happened to the extent conspiracists claimed they did), and fears that a Trump-controlled federal government would abandon California. 

Many of the homes and businesses that we heard had burned down hadn’t, and others that we heard had survived were gone. In an especially heartbreaking early bit of misinformation, a local child-care facility shared a Facebook post stating that FEMA was handing out vouchers to pay 90% of your rent for the next three years—except FEMA doesn’t hand out rent vouchers without an application process. I quietly reached out to the source, who took it down. 

In this information vacuum, and given my work, friends started asking me questions, and answering them took energy and time I didn’t have. Honestly, the “disinformation researcher” was largely just as clueless as everyone else. 

Some of the questions were harmless enough. At one point a friend texted me about a picture from Facebook of a burned Bible page that survived the fire when everything else had turned to ash. It looked too corny and convenient to be real. But I had also found a burned page of Psalms that had survived. I kept it in a ziplock bag because it seemed like the right thing to do. So I told my friend I didn’t know if it was real. I still don’t—but I also still have that ziplock somewhere.

Under attack

As weeks passed, we began to deal with another major issue where truth and misinformation walked together: the reasonable worry that a new president who constantly belittled California would not be willing to provide relief funds

Recovery depended on FEMA to distribute grants, on the EPA to clear toxic debris, on the Small Business Administration to make loans for rebuilding or repairing homes, on the Army Corps of Engineers to remove the detritus of burned structures, and so much more. How would this square with the new “government efficiency” mandate touting the trillions of dollars and tens of thousands of jobs to be cut from the federal budget? 

Nobody knew—including the many kind government employees who spent months in Altadena helping us recover while silently wondering if they were about to be fired.

We dealt with scammers, grifters, squatters, thieves, and even tow truck companies that simply stole cars parked outside burned lots and held them for ransom. After a decade of helping people recognize scams and frauds, there was little I could do when they came for us.

Many residents of Altadena began to have trepidation about accepting government assistance, particularly in its Black community, which already had a well-earned deep distrust of the federal government. Many Black residents felt that their needs and stories were being left behind in the recovery, and feared they would be the first to be priced out of whatever Altadena would become in the future.

Outreach in person became critical. I happened to meet the two-star general in charge of the Army Corps’ effort at lunch one day, as he and his team tried to find outside-the-box ways to engage with exhausted and wary residents. He told me they had tried to use technology—texts, emails, clips designed to go viral—but it was too much information, all apparently delivered in the wrong way. Many of the people they needed to reach, particularly older residents, didn’t use social media, weren’t able to communicate well via text, and were easy prey for sophisticated scammers. It was also easy for the real information to get lost as we got bombarded with communications, including many from hoaxers and frauds.

This, too, wasn’t new to me. Many of the movements I’ve covered are awash in grift and worthless wellness products. I know the signs of a scam and a snake-oil salesman. Still, I watched helplessly as my friends and my community, desperate for help, were turned into chum for cash-hungry sharks opening their jaws wide. 

The community was hammered by dodgy contractors and fly-by-night debris removal companies, relief scams and phony grants, and spam calls from “repair companies” and builders. We dealt with scammers, grifters, squatters, thieves, and even tow truck companies that simply stole cars parked outside burned lots and held them for ransom. We were also victimized by looting: Abandoned wires on our lot were stripped for copper, and our neighbor’s unlocked garage was ransacked. After a decade of helping people recognize scams and frauds, there was little I could do when they came for us.

The fear of being conned was easily transmittable, even to me personally. After hearing of friends who couldn’t get a FEMA grant because a previous owner of their home had fraudulently filed an application, we delayed our own appointment with FEMA for weeks. The agency’s call had come so out of the blue that we were convinced it was fake. Maybe my job made me overcautious, or maybe we were just paralyzed by the sheer tonnage of decisions and calls that needed to be handled. Whatever the reason, the fear meant we later had to make multiple calls just to get our meeting rescheduled. It’s a small thing, but when you’re as exhausted and dispirited as we were, there are no small things. 

Contractors for the US Army Corps of Engineers remove hazardous materials from a home destroyed in the Eaton Fire, near a burned-out car.
STEPHANIE ARNETT/MIT TECHNOLOGY REVIEW | GETTY IMAGES

Making all this even more frustrating was that the scammers, the people spinning tales of lasers and endangered fish and antifa, were very much ignoring the reality: that our planet is trying to kill us. While federal officials recently made an arrest in the Palisades Fire, the direct causes of that fire and the nearby Eaton Fire may still take years of investigation and litigation to be fully known. But even now, it can’t be denied to any reasonable degree that climate change worsened the wind that made the fires spread more quickly.

The Santa Ana winds bombarding Southern California were among the worst ever to hit the region. Their ferocity drove the embers well beyond the nominal fire danger line, particularly in Altadena. Many landed in brush left brittle and dead by the decades-long drought plaguing California. And they had even more fuel because the previous two winters had been among the wettest in the region’s recent history. Such rapid swings between wet and dry or cold and hot have become so common around the world that they even have a name: climate whiplash

There are the conspiracy theory gurus who see this and make money off it, peddling disinformation on their podcasts and livestreams, while blaming everyone and everything but the real reasons. Many of these figures have spent decades railing against the very idea that the climate could change. And if it is changing, they claimed, human consumption and urbanization have nothing to do with it. When faced with a disaster that undeniably reflected climate change at work, their business models—which rely on sales of subscriptions and merchandise—demanded that they just keep denying it was climate change at work.

As more cities and countries deal with “once in a century” climate disasters, I have no doubt that these figures will continue to deflect attention away from human activity. They will use crackpot science, conspiracy theories, politics, and—increasingly—fake videos depicting whatever AI can generate. They will prey on their audiences’ limited understanding of basic science, their inability to perceive how climate and weather differ, and their fears that globalist power brokers will somehow use the weather against them. And their message will spread with little pushback from social media platforms more concerned with virality and shareholder value than truth.

Resisting the temptation

When you cover disinformation and live through an event creating a massive volume of disinformation, it’s like floating outside your body on an operating table as your heart is being worked on, while also being a heart surgeon. I knew I should be trying to help. But I did not have the mental capacity, the time, or, to be honest, the interest in covering what the worst people on the internet were saying about the worst time of my life. I had very real questions about where my family would live. Thinking about my career was not a priority. 

But of course, these experiences cannot now be excised from my career. I’ve spent a lot of time talking about how trauma influences conspiracism; see how the isolation and boredom of covid created a new generation of conspiracy theory believers. And now I had my own trauma, and it has been a test of my abilities as a journalist and a thinker to avoid falling into the pit of despair.

At the same time, I have a much deeper understanding of the psychology at work in conspiracy belief. One of the biggest reasons conspiracy theories take off after a disaster is that they serve to make sense out of something that makes no sense. Neighborhoods aren’t supposed to burn down in an era of highly trained firefighters and seemingly fireproof materials. They especially aren’t supposed to burn down in Los Angeles, one of the wealthiest cities on the planet. These were seven- and eight-figure homes going up like matches. There must be a reason, people figured. Someone, or something, must be responsible.

So, as I emerge from the haze to something resembling “normal,” I feel more compassion and understanding for trauma victims who turn to conspiracy theories. Having faced the literal burning down of my life, I get the urge to assign meaning to such a calamity and point a finger at whoever we think did it to us. 

Meanwhile, the people of Altadena and Pacific Palisades continue to slowly put our lives and communities back together. The effects of both our warming planet and our disinformation crisis continue to assert themselves every day. It’s still alluring to look for easy answers in outrageous conspiracy theories, but such answers are not real and offer no actual help—only the illusion of help.

It’s equally tempting for someone who researches and debunks conspiracy theories to mock or belittle the people who believe these ideas. How could anyone be so dumb as to think Joe Biden caused the fire that burned down my home?

I kept my mouth shut that day at the meeting in the church, though, again, I can now sympathize much more deeply with something I’d otherwise think completely inane. 

But even a journalist who lost his house is still a journalist. So I decided early on that what I really needed to do was keep Altadena in the news. I went on TV and radio, blogged, and happily told our story to anyone who asked. I focused on the community, the impact, the people who would be working to recover long after the national spotlight moved to the next shiny object.

If there is a professional lesson to be taken from this nightmare, it might be that the people caught up in tragedies are exactly that: caught up. And those who believe this nonsense find something of value in it. They find hope and comfort and the reassurance that whoever did this to them will get what they deserve. 

I could have done it too, throwing away years of experience to embrace conspiracist nihilism in the face of unspeakable trauma. After all, those poor people going through this weren’t just on my TV. 

They were my friends. They were me. They could be anyone.

Mike Rothschild is a journalist and an expert on the growth and impact of conspiracy theories and disinformation. He has written three books, including The Storm Is Upon Us, about the QAnon conspiracy movement, and Jewish Space Lasers, about the myths around the Rothschild banking family. He also is a frequent expert witness in legal cases involving conspiracy theories and has spoken at colleges and conferences around the country. He lives in Southern California.

What’s next for carbon removal?

MIT Technology Review’s What’s Next series looks across industries, trends, and technologies to give you a first look at the future. You can read the rest of them here.

In the early 2020s, a little-known aquaculture company in Portland, Maine, snagged more than $50 million by pitching a plan to harness nature to fight back against climate change. The company, Running Tide, said it could sink enough kelp to the seafloor to sequester a billion tons of carbon dioxide by this year, according to one of its early customers.

Instead, the business shut down its operations last summer, marking the biggest bust to date in the nascent carbon removal sector.

Its demise was the most obvious sign of growing troubles and dimming expectations for a space that has spawned hundreds of startups over the last few years. A handful of other companies have shuttered, downsized, or pivoted in recent months as well. Venture investments have flagged. And the collective industry hasn’t made a whole lot more progress toward that billion-ton benchmark.

The hype phase is over and the sector is sliding into the turbulent business trough that follows, warns Robert Höglund, cofounder of CDR.fyi, a public-benefit corporation that provides data and analysis on the carbon removal industry.

“We’re past the peak of expectations,” he says. “And with that, we could see a lot of companies go out of business, which is natural for any industry.”

The open question is: If the carbon removal sector is heading into a painful if inevitable clearing-out cycle, where will it go from there? 

The odd quirk of carbon removal is that it never made a lot of sense as a business proposition: It’s an atmospheric cleanup job, necessary for the collective societal good of curbing climate change. But it doesn’t produce a service or product that any individual or organization strictly needs—or is especially eager to pay for.

To date, a number of businesses have voluntarily agreed to buy tons of carbon dioxide that companies intend to eventually suck out of the air. But whether they’re motivated by sincere climate concerns or pressures from investors, employees, or customers, corporate do-goodism will only scale any industry so far. 

Most observers argue that whether carbon removal continues to bobble along or transforms into something big enough to make a dent in climate change will depend largely on whether governments around the world decide to pay for a whole, whole lot of it—or force polluters to. 

“Private-sector purchases will never get us there,” says Erin Burns, executive director of Carbon180, a nonprofit that advocates for the removal and reuse of carbon dioxide. “We need policy; it has to be policy.”

What’s the problem?

The carbon removal sector began to scale up in the early part of this decade, as increasingly grave climate studies revealed the need to dramatically cut emissions and suck down vast amounts of carbon dioxide to keep global warming in check.

Specifically, nations may have to continually remove as much as 11 billion tons of carbon dioxide per year by around midcentury to have a solid chance of keeping the planet from warming past 2 °C over preindustrial levels, according to a UN climate panel report in 2022.

A number of startups sprang up to begin developing the technology and building the infrastructure that would be needed, trying out a variety of approaches like sinking seaweed or building carbon-dioxide-sucking factories.

And they soon attracted customers. Companies including Stripe, Google, Shopify, Microsoft, and others began agreeing to pre-purchase tons of carbon removal, hoping to stand up the nascent industry and help offset their own climate emissions. Venture investments also flooded into the space, peaking in 2023 at nearly $1 billion, according to data provided by PitchBook.

From early on, players in the emerging sector sought to draw a sharp distinction between conventional carbon offset projects, which studies have shown frequently exaggerate climate benefits, and “durable” carbon removal that could be relied upon to suck down and store away the greenhouse gas for decades to centuries. There’s certainly a big difference in the price: While buying carbon offsets through projects that promise to preserve forests or plant trees might cost a few dollars per ton, a ton of carbon removal can run hundreds to thousands of dollars, depending on the approach. 

That high price, however, brings big challenges. Removing 10 billion tons of carbon dioxide a year at, say, $300 a ton adds up to a global price tag of $3 trillion—a year. 

Which brings us back to the fundamental question: Who should or would foot the bill to develop and operate all the factories, pipelines, and wells needed to capture, move, and bury billions upon billions of tons of carbon dioxide?

The state of the market

The market is still growing, as companies voluntarily purchase tons of carbon removal to make strides toward their climate goals. In fact, sales reached an all-time high in the second quarter of this year, mostly thanks to several massive purchases by Microsoft.

But industry sources fear that demand isn’t growing fast enough to support a significant share of the startups that have formed or even the projects being built, undermining the momentum required to scale the sector up to the size needed by midcentury.

To date, all those hundreds of companies that have spun up in recent years have disclosed deals to sell some 38 million tons of carbon dioxide pulled from the air, according to CDR.fyi. That’s roughly the amount the US pumps out in energy-related emissions every three days. 

And they’ve only delivered around 940,000 tons of carbon removal. The US emits that much carbon dioxide in less than two hours. (Not every transaction is publicly announced or revealed to CDR.fyi, so the actual figures could run a bit higher.)

Another concern is that the same handful of big players continue to account for the vast majority of the overall purchases, leaving the health and direction of the market dependent on their whims and fortunes. 

Most glaringly, Microsoft has agreed to buy 80% of all the carbon removal purchased to date, according to  CDR.fyi. The second-biggest buyer is Frontier, a coalition of companies that includes Google, Meta, Stripe, and Shopify, which has committed to spend $1 billion.

If you strip out those two buyers, the market shrinks from 16 million tons under contract during the first half of this year to just 1.2 million, according to data provided to MIT Technology Review by CDR.fyi. 

Signs of trouble

Meanwhile, the investor appetite for carbon removal is cooling. For the 12-month period ending in the second quarter of 2025, venture capital investments in the sector fell more than 13% from the same period last year, according to data provided by PitchBook. That tightening funding will make it harder and harder for companies that aren’t bringing in revenue to stay afloat.

Other companies that have already shut down include the carbon removal marketplace Nori, the direct air capture company Noya and Alkali Earth, which was attempting to use industrial by-products to tie up carbon dioxide.

Still other businesses are struggling. Climeworks, one of the first companies to build direct-air-capture (DAC) factories, announced it was laying off 10% of its staff in May, as it grapples with challenges on several fronts.

The company’s plans to collaborate on the development of a major facility in the US have been at least delayed as the Trump administration has held back tens of millions of dollars in funding granted in 2023 under the Department of Energy’s Regional Direct Air Capture Hubs program. It now appears the government could terminate the funding altogether, along with perhaps tens of billions of dollars’ worth of additional grants previously awarded for a variety of other US carbon removal and climate tech projects.

“Market rumors have surfaced, and Climeworks is prepared for all scenarios,” Christoph Gebald, one of the company’s co-CEOs, said in a previous statement to MIT Technology Review. “The need for DAC is growing as the world falls short of its climate goals and we’re working to achieve the gigaton capacity that will be needed.”

But purchases from direct-air-capture projects fell nearly 16% last year and account for just 8% of all carbon removal transactions to date. Buyers are increasingly looking to categories that promise to deliver tons faster and for less money, notably including burying biochar or installing carbon capture equipment on bioenergy plants. (Read more in my recent story on that method of carbon removal, known as BECCS, here.)

CDR.fyi recently described the climate for direct air capture in grim terms: “The sector has grown rapidly, but the honeymoon is over: Investment and sales are falling, while deployments are delayed across almost every company.”

“Most DAC companies,” the organization added, “will fold or be acquired.”

What’s next?

In the end, most observers believe carbon removal isn’t really going to take off unless governments bring their resources and regulations to bear. That could mean making direct purchases, subsidizing these sectors, or getting polluters to pay the costs to do so—for instance, by folding carbon removal into market-based emissions reductions mechanisms like cap-and-trade systems. 

More government support does appear to be on the way. Notably, the European Commission recently proposed allowing “domestic carbon removal” within its EU Emissions Trading System after 2030, integrating the sector into one of the largest cap-and-trade programs. The system forces power plants and other polluters in member countries to increasingly cut their emissions or pay for them over time, as the cap on pollution tightens and the price on carbon rises. 

That could create incentives for more European companies to pay direct-air-capture or bioenergy facilities to draw down carbon dioxide as a means of helping them meet their climate obligations.

There are also indications that the International Civil Aviation Organization, a UN organization that establishes standards for the aviation industry, is considering incorporating carbon removal into its market-based mechanism for reducing the sector’s emissions. That might take several forms, including allowing airlines to purchase carbon removal to offset their use of traditional jet fuel or requiring the use of carbon dioxide obtained through direct air capture in some share of sustainable aviation fuels.

Meanwhile, Canada has committed to spend $10 million on carbon removal and is developing a protocol to allow direct air capture in its national offsets program. And Japan will begin accepting several categories of carbon removal in its emissions trading system

Despite the Trump administration’s efforts to claw back funding for the development of carbon-sucking projects, the US does continue to subsidize storage of carbon dioxide, whether it comes from power plants, ethanol refineries, direct-air-capture plants, or other facilities. The so-called 45Q tax credit, which is worth up to $180 a ton, was among the few forms of government support for climate-tech-related sectors that survived in the 2025 budget reconciliation bill. In fact, the subsidies for putting carbon dioxide to other uses increased.

Even in the current US political climate, Burns is hopeful that local or federal legislators will continue to enact policies that support specific categories of carbon removal in the regions where they make the most sense, because the projects can provide economic growth and jobs as well as climate benefits.

“I actually think there are lots of models for what carbon removal policy can look like that aren’t just things like tax incentives,” she says. “And I think that this particular political moment gives us the opportunity in a unique way to start to look at what those regionally specific and pathway specific policies look like.”

The dangers ahead

But even if more nations do provide the money or enact the laws necessary to drive the business of durable carbon renewal forward, there are mounting concerns that a sector conceived as an alternative to dubious offset markets could increasingly come to replicate their problems.

Various incentives are pulling in that direction.

Financial pressures are building on suppliers to deliver tons of carbon removal. Corporate buyers are looking for the fastest and most affordable way of hitting their climate goals. And the organizations that set standards and accredit carbon removal projects often earn more money as the volume of purchases rises, creating clear conflicts of interest.

Some of the same carbon registries that have long signed off on carbon offset projects have begun creating standards or issuing credits for various forms of carbon removal, including Verra and Gold Standard.

“Reliable assurance that a project’s declared ton of carbon savings equates to a real ton of emissions removed, reduced, or avoided is crucial,” Cynthia Giles, a senior EPA advisor under President Biden, and Cary Coglianese, a law professor at the University of Pennsylvania, wrote in a recent editorial in Science. “Yet extensive research from many contexts shows that auditors selected and paid by audited organizations often produce results skewed toward those entities’ interests.”

Noah McQueen, the director of science and innovation at Carbon180, has stressed that the industry must strive to counter the mounting credibility risks, noting in a recent LinkedIn post: “Growth matters, but growth without integrity isn’t growth at all.”

In an interview, McQueen said that heading off the problem will require developing and enforcing standards to truly ensure that carbon removal projects deliver the climate benefits promised. McQueen added that to gain trust, the industry needs to earn buy-in from the communities in which these projects are built and avoid the environmental and health impacts that power plants and heavy industry have historically inflicted on disadvantaged communities.

Getting it right will require governments to take a larger role in the sector than just subsidizing it, argues David Ho, a professor at the University of Hawaiʻi at Mānoa who focuses  on ocean-based carbon removal.

He says there should be a massive, multinational research drive to determine the most effective ways of mopping up the atmosphere with minimal environmental or social harm, likening it to a Manhattan Project (minus the whole nuclear bomb bit).

“If we’re serious about doing this, then let’s make it a government effort,” he says, “so that you can try out all the things, determine what works and what doesn’t, and you don’t have to please your VCs or concentrate on developing [intellectual property] so you can sell yourself to a fossil-fuel company.”

Ho adds that there’s a moral imperative for the world’s historically biggest climate polluters to build and pay for the carbon-sucking and storage infrastructure required to draw down billions of tons of greenhouse gas. That’s because the world’s poorest, hottest nations, which have contributed the least to climate change, will nevertheless face the greatest dangers from intensifying heat waves, droughts, famines, and sea-level rise.

“It should be seen as waste management for the waste we’re going to dump on the Global South,” he says, “because they’re the people who will suffer the most from climate change.”

Correction (October 24): An earlier version of this article referred to Noya as a carbon removal marketplace. It was a direct air capture company.

The elephant in the room for energy tech? Uncertainty.

At a conference dedicated to energy technology that I attended this week, I noticed an outward attitude of optimism and excitement. But it’s hard to miss the current of uncertainty just underneath. 

The ARPA-E Energy Innovation Summit, held this year just outside Washington, DC, gathers some of the most cutting-edge innovators working on everything from next-generation batteries to plants that can mine for metals. Researchers whose projects have received funding from ARPA-E—part of the US Department of Energy that gives money to high-risk research in energy—gather to show their results and mingle with each other, investors, and nosy journalists like yours truly. (For more on a few of the coolest things I saw, check out this story.)

This year, though, there was an elephant in the room, and it’s the current state of the US federal government. Or maybe it’s climate change? In any case, the vibes were weird. 

The last time I was at this conference, two years ago, climate change was a constant refrain on stage and in conversations. The central question was undoubtedly: How do we decarbonize, generate energy, and run our lives without relying on polluting fossil fuels? 

This time around, I didn’t hear the phrase “climate change” once during the opening session, which included speeches from US Secretary of Energy Chris Wright and acting ARPA-E director Daniel Cunningham. The focus was on American energy dominance—on how we can get our hands on more, more, more energy to meet growing demand. 

Last week, Wright spoke at an energy conference in Houston and had a lot to say about climate, calling climate change a “side effect of building the modern world” and climate policies irrational and quasi-religious, and he said that when it came to climate action, the cure had become worse than the disease

I was anticipating similar talking points at the summit, but this week, climate change hardly got a mention.

What I noticed in Wright’s speech and in the choice of programming throughout the conference is that some technologies appear to be among the favored, and others are decidedly less prominent. Nuclear power and fusion were definitely on the “in” list. There was a nuclear panel in the opening session, and in his remarks Wright called out companies like Commonwealth Fusion Systems and Zap Energy. He also praised small modular reactors

Renewables, including wind and solar, were mentioned only in the context of their inconsistency—Wright dwelled on that, rather than on other facts I’d argue are just as important, like that they are among the cheapest methods of generating electricity today. 

In any case, Wright seemed appropriately hyped about energy, given his role in the administration. “Call me biased, but I think there’s no more impactful place to work in than energy,” he said during his opening remarks on the first morning of the summit. He sang the praises of energy innovation, calling it a tool to drive progress, and outlined his long career in the field. 

This all comes after a chaotic couple of months for the federal government that are undoubtedly affecting the industry. Mass layoffs have hit federal agencies, including the Department of Energy. President Donald Trump very quickly tried to freeze spending from the Inflation Reduction Act, which includes tax credits and other support for EVs and power plants. 

As I walked around the showcase and chatted with experts over coffee, I heard a range of reactions to the opening session and feelings about this moment for the energy sector. 

People working in industries the Trump administration seems to favor, like nuclear energy, tended to be more positive. Some in academia who rely on federal grants to fund their work were particularly nervous about what comes next. One researcher refused to talk to me when I said I was a journalist. In response to my questions about why they weren’t able to discuss the technology on display at their booth, another member on the same project said only that it’s a wild time.

Making progress on energy technology doesn’t require that we all agree on exactly why we’re doing it. But in a moment when we need all the low-carbon technologies we can get to address climate change—a problem scientists overwhelmingly agree is a threat to our planet—I find it frustrating that politics can create such a chilling effect in some sectors. 

At the conference, I listened to smart researchers talk about their work. I saw fascinating products and demonstrations, and I’m still optimistic about where energy can go. But I also worry that uncertainty about the future of research and government support for emerging technologies will leave some valuable innovations in the dust. 

This article is from The Spark, MIT Technology Review’s weekly climate newsletter. To receive it in your inbox every Wednesday, sign up here.

4 technologies that could power the future of energy

Where can you find lasers, electric guitars, and racks full of novel batteries, all in the same giant room? This week, the answer was the 2025 ARPA-E Energy Innovation Summit just outside Washington, DC.

Energy innovation can take many forms, and the variety in energy research was on display at the summit. ARPA-E, part of the US Department of Energy, provides funding for high-risk, high-reward research projects. The summit gathers projects the agency has funded, along with investors, policymakers, and journalists.

Hundreds of projects were exhibited in a massive hall during the conference, featuring demonstrations and research results. Here are four of the most interesting innovations MIT Technology Review spotted on site. 

Steel made with lasers

Startup Limelight Steel has developed a process to make iron, the main component in steel, by using lasers to heat iron ore to super-high temperatures. 

Steel production makes up roughly 8% of global greenhouse gas emissions today, in part because most steel is still made with blast furnaces, which rely on coal to hit the high temperatures that kick off the required chemical reactions. 

Limelight instead shines lasers on iron ore, heating it to temperatures over 1,600 °C. Molten iron can then be separated from impurities, and the iron can be put through existing processes to make steel. 

The company has built a small demonstration system with a laser power of about 1.5 kilowatts, which can process between 10 and 20 grams of ore. The whole system is made up of 16 laser arrays, each just a bit larger than a postage stamp.

The components in the demonstration system are commercially available; this particular type of laser is used in projectors. The startup has benefited from years of progress in the telecommunications industry that has helped bring down the cost of lasers, says Andy Zhao, the company’s cofounder and CTO. 

The next step is to build a larger-scale system that will use 150 kilowatts of laser power and could make up to 100 tons of steel over the course of a year.

Rocks that can make fuel

The hunks of rock at a booth hosted by MIT might not seem all that high-tech, but someday they could help produce fuels and chemicals. 

A major topic of conversation at the ARPA-E summit was geologic hydrogen—there’s a ton of excitement about efforts to find underground deposits of the gas, which can be used as a fuel across a wide range of industries, including transportation and heavy industry. 

Last year, ARPA-E funded a handful of projects on the topic, including one in Iwnetim Abate’s lab at MIT. Abate is among the researchers who are aiming not just to hunt for hydrogen, but to actually use underground conditions to help produce it. Earlier this year, his team published research showing that by using catalysts and conditions common in the subsurface, scientists can produce hydrogen as well as other chemicals, like ammonia. Abate cofounded a spinout company, Addis Energy, to commercialize the research, which has since also received ARPA-E funding

All the rocks on the table, from the chunk of dark, hard basalt to the softer talc, could be used to produce these chemicals. 

An electric guitar powered by iron nitride magnets

The sound of music drifted from the Niron Magnetics booth across nearby walkways. People wandering by stopped to take turns testing out the company’s magnets, in the form of an electric guitar. 

Most high-powered magnets today contain neodymium—demand for them is set to skyrocket in the coming years, especially as the world builds more electric vehicles and wind turbines. Supplies could stretch thin, and the geopolitics are complicated because most of the supply comes from China. 

Niron is making new magnets that don’t contain rare earth metals. Instead, Niron’s technology is based on more abundant materials: nitrogen and iron. 

The guitar is a demonstration product—today, magnets in electric guitars typically contain aluminum, nickel, and cobalt-based magnets that help translate the vibrations from steel strings into an electric signal that is broadcast through an amplifier. Niron made an instrument using its iron nitride magnets instead. (See photos of the guitar from an event last year here.)

Niron opened a pilot commercial facility in late 2024 that has the capacity to produce 10 tons of magnets annually. Since we last covered Niron, in early 2024, the company has announced plans for a full-scale plant, which will have an annual capacity of about 1,500 tons of magnets once it’s fully ramped up. 

Batteries for powering high-performance data centers

The increasing power demand from AI and data centers was another hot topic at the summit, with server racks dotting the showcase floor to demonstrate technologies aimed at the sector. One stuffed with batteries caught my eye, courtesy of Natron Energy. 

The company is making sodium-ion batteries to help meet power demand from data centers. 

Data centers’ energy demands can be incredibly variable—and as their total power needs get bigger, those swings can start to affect the grid. Natron’s sodium-ion batteries can be installed at these facilities to help level off the biggest peaks, allowing computing equipment to run full out without overly taxing the grid, says Natron cofounder and CTO Colin Wessells. 

Sodium-ion batteries are a cheaper alternative to lithium-based chemistries. They’re also made without lithium, cobalt, and nickel, materials that are constrained in production or processing. We’re seeing some varieties of sodium-ion batteries popping up in electric vehicles in China.

Natron opened a production line in Michigan last year, and the company plans to open a $1.4 billion factory in North Carolina

Cattle burping remedies: 10 Breakthrough Technologies 2025

WHO

Blue Ocean Barns, DSM-Firmenich, Rumin8, Symbrosia

WHEN

Now

Companies are finally making real progress on one of the trickiest problems for climate change: cow burps. 

The world’s herds of cattle belch out methane as a by-product of digestion, as do sheep and goats. That powerful greenhouse gas makes up the single biggest source of livestock emissions, which together contribute 11% to 20% of the world’s total climate pollution, depending on the analysis.

It’s hard to meaningfully cut those emissions by reducing demand, simply because hamburgers, steaks, butter, and milk taste good—and a global population that’s growing larger and wealthier is only set to consume more of these foods. 

Explore the full 2025 list of 10 Breakthrough Technologies.

Enter the cattle burping supplement. DSM-Firmenich, a Netherlands-based conglomerate that produces fragrances, pharmaceuticals, and other products, has developed a feed supplement, Bovaer, that it says can cut methane emissions by 30% in dairy cattle and even more in beef cattle. It works by inhibiting an enzyme in the animals’ guts, which ordinarily helps convert hydrogen and carbon dioxide produced during digestion into the methane that they burp up. 

In May 2024, the Food and Drug Administration cleared the way for its use in the US. DSM says the additive is now available in more than 55 countries, including Australia, Brazil, and members of the European Union.

Meanwhile, startups like Blue Ocean Barns, Rumin8, and Symbrosia are developing, testing, or seeking approval for products derived from a type of red seaweed, which could reduce methane levels even further. Still other organizations are trying to tackle the problem in longer-lasting ways, by developing vaccines or altering the microbes in the guts of cattle.

It remains to be seen how many cattle farmers will pay for such products. But in the case of Bovaer, farmers who use it can earn greenhouse-gas credits that some companies will buy on voluntary carbon markets as a way to reduce their corporate climate footprints, according to Elanco, which is marketing the additive in the US. Meanwhile, Rumin8 says cattle taking its supplements could deliver more meat and milk.

The additives certainly don’t solve the whole problem. The cattle industry needs to take other major steps to cut its climate emissions, including halting its encroachment into carbon-absorbing forests. And to make any real dent in demand, food companies will have to develop better, cheaper, cleaner alternative products, like plant-based burgers and dairy substitutes.

But methane-cutting supplements increasingly look like a promising way to solve a big chunk of a very big problem.

Cleaner jet fuel: 10 Breakthrough Technologies 2025

WHO

Gevo, LanzaJet, Montana Renewables, Neste, World Energy

WHEN

Now

All the world’s planes consumed roughly 100 billion gallons of jet fuel as they crisscrossed the planet in 2024. Only about 0.5% of it was something other than fossil fuel. That could soon change.

Alternative jet fuels could slash aviation emissions—which have caused about 4% of global warming to date. These new fuels can be made with materials like used cooking oils, crop residue, industrial waste, and carbon dioxide captured from the air. Depending on the source, they can reduce emissions by half or nearly eliminate them. And they can generally be used in existing planes, which could enable quick climate progress.

Explore the full 2025 list of 10 Breakthrough Technologies.

More governments are now setting targets or passing legislation requiring airlines to begin using these alternative fuels (sometimes called sustainable aviation fuels, or SAFs). Starting this year, alternative fuels must make up at least 2% of the fuel used at airports in the European Union and UK. That mandate will ramp up in the coming decades, reaching 70% in the EU by 2050.

Today, nearly all commercially available alternative fuel is made with waste fats, oils, and greases. Montana Renewables recently got a $1.44 billion loan commitment from the US Department of Energy to expand one facility for such production. Still, these materials remain in limited supply.

Companies using other technologies and inputs are making progress scaling up. LanzaJet opened the first commercial-scale facility to make jet fuel from ethanol in early 2024, with a capacity of 9 million gallons annually. Synthetic fuels made with carbon dioxide could further expand options for airlines, though those fuels aren’t being produced at commercial scale yet.

One crucial factor for alternative jet fuels moving forward will be cost—on average, SAFs on the market today tend to be nearly three times more expensive than conventional jet fuel. Having more companies producing more fuel should help bring down the price, though newer fuels could be even more costly. 

How wind tech could help decarbonize cargo shipping

Inhabitants of the Marshall Islands—a chain of coral atolls in the center of the Pacific Ocean—rely on sea transportation for almost everything: moving people from one island to another, importing daily necessities from faraway nations, and exporting their local produce. For millennia they sailed largely in canoes, but much of their seafaring movement today involves big, bulky, diesel-fueled cargo ships that are heavy polluters. 

They’re not alone, of course. Cargo shipping is responsible for about 3% of the world’s annual greenhouse-­gas emissions, and at the current rate of growth, the global industry could account for 10% of emissions by 2050. 

Marshallese shipping represents just a drop in the ocean of global greenhouse-gas pollution; larger, more industrially developed countries are responsible for far more. But the islands have been disproportionately experiencing the consequences of human-made climate change: warming waters, more frequent extreme weather, and rising sea levels.

All this has created a sense of urgency for people like Alson Kelen, who lives and works in Majuro, the islands’ capital. He’s the founder of Waan Aelõñ, a Marshallese canoeing organization that is focused on keeping the region’s ancient and more environmentally sustainable maritime traditions alive. In doing so, he hopes to help his nation fully decarbonize its fleets. Efforts include training local youths to build traditional Marshallese canoes (to replace small, motor-powered speedboats) and larger sailboats fitted with solar panels (to replace medium-size cargo ships). He was also an advisor on construction of the Juren Ae, a cargo sailboat (shown at right) inspired by traditional Marshallese vessels, which made its maiden voyage in 2024 and can carry 300 metric tons of cargo. The Marshall Islands Shipping Corporation hopes it offers a blueprint for cleaner cargo transportation across the Pacific; relative to a fuel-powered cargo ship, the vessel could decrease emissions by up to 80%. It’s “a beautiful big sister of our little canoes,” says Kelen.

Though hyperlocal, Kelen’s work is part of a global project from the International Maritime Organization to reduce emissions associated with cargo shipping to net zero by 2050. Beyond these tiny islands, much of the effort to meet the IMO’s goals focuses on replacing gasoline with alternatives such as ammonia, methane, nuclear power, and hydrogen. And there’s also what the Marshallese people have long relied on: wind power. It’s just one option on the table, but the industry cannot decarbonize quickly enough to meet the IMO’s goals without a role for wind propulsion, says Christiaan De Beukelaer, a political anthropologist and author of Trade Winds: A Voyage to a Sustainable Future for Shipping. “If you take time into consideration, wind is indispensable,” he says. Studies show that deploying wind power on vessels could lower the shipping industry’s carbon dioxide emissions by 20%.     

“What wind does is it effectively cuts out a few uncertainties,” says De Beukelaer—variables such as the fluctuation of fuel prices and the costs from any carbon pricing scheme the industry may adopt. The IMO is technology agnostic, meaning it sets the goals and safety standards but lets the market find the best ways to attain them. A spokesperson from the organization says wind propulsion is one of many avenues being explored.      

Sails can be used either to fully power a vessel or to supplement the motors as a way of reducing fuel consumption for large bulk carriers, oil tankers, and the roll-on/roll-off vessels used to transport airplanes and cars worldwide. Modern cargo sails come in several shapes, sizes, and styles, including wings, rotors, suction sails, and kites.

“If we’ve got five and a half thousand years of experience, isn’t this just a no-brainer?” says Gavin Allwright, secretary-general of the International Windship Association.

Older cargo boats with new sails can use propulsive energy from the wind for up to 30% of their power, while cargo vessels designed specifically for wind could rely on it for up to 80% of their needs, says Allwright, who is still working on standardized measurement criteria to figure out which combination of ship and sail model is most efficient.

“There are so many variables involved,” he says—from the size of the ship to the captain steering it. The 50th large vessel fitted with wind-harnessing tech set sail in October 2024, and he predicts that maritime wind power is set to boom by the beginning of 2026. 


drone view over a ship at sea with vertical metal sails

COURTESY OF OCEANBIRD

Hard wings

One of the more popular designs for cargo ships is a rigid saila hard, winglike structure that is placed vertically on top of the vessel. 

“It’s very much like an airplane wing,” says Niclas Dahl, managing director of Oceanbird, a Swedish company that develops these sails. Each one has a main and a flap, which creates a chamber where the wind speed is faster on the outside than the inside. In an aircraft, that discrepancy generates lift force, but in this case, says Dahl, it propels the ship forward. The wings are rigid, but they can be swiveled around and adjusted to capture the wind depending on where it’s coming from, and they can be folded and retracted close to the deck of the ship when it is nearing a dock.

One of Oceanbird’s sailsthe 40-meter-high, 14-meter-wide Wing 560, made of high-strength steel, glass fiber, and recycled polyethylene terephthalatecould help cargo ships reduce fuel use by up to 10% per trip, according to the company’s calculations. Oceanbird is installing its first set of wings on a cargo vessel that transports cars, which was scheduled to be ready by the end of 2024.

Oceanbird, though, is just one manufacturer; by late 2024, eight cargo vessels propelled by hard wings were cruising around the world, most of them generalized bulk carriers and oil tankers.


COURTESY OF CARGOKITE

Kites

Other engineers and scientists are working to power cargo vessels with kites like those that propel paragliders. These kites are made from mixtures of UV-resistant polyester, and they are tethered to the ship’s bow and fly up to 200 to 300 meters above the ship, where they can make the best use of the constant winds at that altitude to basically tug the boat forward. To maximize lift, the kites are controlled by computers to operate in the sweet spot where wind is most constant. Studies show that a 400-square-meter kite can produce fuel savings of 9% to 15%.

“The main reason for us believing in kites is high-altitude winds,” says Tim Linnenweber, cofounder of CargoKite, which designs micro cargo ships that can be powered this way. “You basically have an increasing wind speed the higher you go, and so more consistent, more reliable, more steady winds.” 


COURTESY OF BOUND4BLUE

Suction sails

Initially used for airplanes in the 1930s, suction sails were designed and tested on boats in the 1980s by the oceanographer and diving pioneer Jacques Cousteau. 

Suction sails are chubby metal sails that look something like rotors but more oval, with a pointed side. And instead of making the whole sail spin around, the motor turns on a fan on the inside of the sail that sucks in wind from the outside. Cristina Aleixendri, cofounder of Bound4Blue, a Spanish company building suction sails, explains that the vent pulls air in through lots of little holes in the shell of the sail and creates what physicists call a boundary layera thin layer of air blanketing the sail and thrusting it forward. Bound4Blue’s modern model generates 20% more thrust per square meter of sail than Cousteau’s original design, says Aleixendri, and up to seven times more thrust than a conventional sail. 

Twelve ships fitted with a total of 26 suction sails are currently operating, ranging from fishing boats and oil tankers to roll-on/roll-off vessels. Bound4Blue is working on fitting six ships and has fitted four alreadyincluding one with the largest suction sail ever installed, at 22 meters tall.


COURTESY OF NORSEPOWER

Rotor sails

In the 1920s, the German engineer Anton Flettner had a vision for a wind-powered ship that used vertical, revolving metal cylinders in place of traditional sails. In 1926, a vessel using his novel design, known as the Flettner rotor, crossed the Atlantic for the first time. 

Flettner rotors work thanks to the Magnus effect, a phenomenon that occurs when a spinning object moves through a fluid, causing a lift force that can deflect the object’s path. With Flettner’s design, motors spin the cylinders around, and the pressure difference between the sides of the spinning object generates thrust forward, much like a soccer player bending the trajectory of a ball.

In a modern upgrade of the rotor sail, designed by the Finnish company Norsepower, the cylinders can spin up to 300 times per minute. This produces 10 times more thrust power than a conventional sail. Norsepower has fitted 27 rotor sails on 14 ships out at sea so far, and six more ships equipped with rotor sails from other companies set sail in 2024.

“According to our calculations, the rotor sail is, at the moment, the most efficient wind-assistive power when you look at eurocent per kilowatt-hour,” says Heikki Pöntynen, Norsepower’s CEO. Results from their vessels currently out at sea suggest that fuel savings are “anywhere between 5% to 30% on the whole voyage.” 

Sofia Quaglia is a freelance science journalist whose work has appeared in the New York Times, National Geographic, and New Scientist.

The world’s first industrial-scale plant for green steel promises a cleaner future

As of 2023, nearly 2 billion metric tons of it were being produced annually, enough to cover Manhattan in a layer more than 13 feet thick. 

Making this metal produces a huge amount of carbon dioxide. Overall, steelmaking accounts for around 8% of the world’s carbon emissions—one of the largest industrial emitters and far more than such sources as aviation. The most common manufacturing process yields about two tons of carbon dioxide for every ton of steel.  

A handful of groups and companies are now making serious progress toward low- or zero-emission steel. Among them, the Swedish company Stegra stands out. (Originally named H2 Green Steel, the company renamed itself Stegra—which means “to elevate” in Swedish—in September.) The startup, formed in 2020, has raised close to $7 billion and is building a plant in Boden, a town in northern Sweden. It will be the first industrial-scale plant in the world to make green steel. Stegra says it is on track to begin production in 2026, initially producing 2.5 million metric tons per year and eventually making 4.5 million metric tons. 

The company uses so-called green hydrogen, which is produced using renewable energy, to process iron ore into steel. Located in a part of Sweden with abundant hydropower, Stegra’s plant will use hydro and wind power to drive a massive electrolyzer that splits water to make the hydrogen. The hydrogen gas will then be used to pull the oxygen out of iron ore to make metallic iron—a key step in steelmaking.  

This process of using hydrogen to make iron—and subsequently steel—has already been used at pilot plants by Midrex, an American company from which Stegra is purchasing the equipment. But Stegra will have to show that it will work in a far larger plant.

The world produces about 60,000 metric tons of steel every 15 minutes.

“We have multiple steps that haven’t really been proven at scale before,” says Maria Persson Gulda, Stegra’s chief technology officer. These steps include building one of the world’s largest electrolyzers. 

Beyond the unknowns of scaling up a new technology, Stegra also faces serious business challenges. The steel industry is a low-margin, intensely competitive sector in which companies win customers largely on price.

aerial view of construction site
The startup, formed in 2020, has raised close to $7 billion in financing and expects to begin operations in 2026 at its plant in Boden.
STEGRA

Once operations begin, Stegra calculates, it can come close to producing steel at the same cost as the conventional product, largely thanks to its access to cheap electricity. But it plans to charge 20% to 30% more to cover the €4.5 billion it will take to build the plant. Gulda says the company has already sold contracts for 1.2 million metric tons to be produced in the next five to seven years. And its most recent customers—such as car manufacturers seeking to reduce their carbon emissions and market their products as green—have agreed to pay the 30% premium. 

Now the question is: Can Stegra deliver? 

The secret of hydrogen

To make steel—an alloy of iron and carbon, with a few other elements thrown in as needed—you first need to get the oxygen out of the iron ore dug from the ground. That leaves you with the purified metal.

The most common steelmaking process starts in blast furnaces, where the ore is mixed with a carbon-­rich coal derivative called coke and heated. The carbon reacts with the oxygen in the ore to produce carbon dioxide; the metal left behind then enters another type of furnace, where more oxygen is forced into it under high heat and pressure. The gas reacts with remaining impurities to produce various oxides, which are then removed—leaving steel behind.  

The second conventional method, which is used to make a much smaller share of the world’s steel, is a process called direct reduction. This usually employs natural gas, which is separated into hydrogen and carbon monoxide. Both gases react with the oxygen to pull it out of the iron ore, creating carbon dioxide and water as by-products. 

The iron that remains is melted in an electric arc furnace and further processed to remove impurities and create steel. Overall, this method is about 40% lower in emissions than the blast furnace technique, but it still produces over a ton of carbon dioxide for every ton of steel.

But why not just use hydrogen instead of starting with natural gas? The only by-product would be water. And if, as Stegra plans to do, you use green hydrogen made using clean power, the result is a new and promising way of making steel that can theoretically produce close to zero emissions. 

Stegra’s process is very similar to the standard direct reduction technique, except that since it uses only hydrogen, it needs a higher temperature. It’s not the only possible way to make steel with a negligible carbon footprint, but it’s the only method on the verge of being used at an industrial scale. 

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Stegra has laid the foundations for its plant and is putting the roof and walls on its steel mill. The first equipment has been installed in the building where electric arc furnaces will melt the iron and churn out steel, and work is underway on the facility that will house a 700-megawatt electrolyzer, the largest in Europe.

To make hydrogen, purify iron, and produce 2.5 million metric tons of green steel annually, the plant will consume 10 terawatt-hours of electricity. This is a massive amount, on par with the annual usage of a small country such as Estonia. Though the costs of electricity in Stegra’s agreements are confidential, publicly available data suggest rates around €30 ($32) per megawatt-hour or more. (At that rate, 10 terawatt-hours would cost $320 million.) 

STEGRA

Many of the buyers of the premium green steel are in the automotive industry; they include Mercedes-Benz, Porsche, BMW, Volvo Group, and Scania, a Swedish company that makes trucks and buses. Six companies that make furniture, appliances, and construction material—including Ikea—have also signed up, as have five companies that buy steel and distribute it to many different manufacturers.

Some of these automakers—including Volvo, which will buy from Stegra and rival SSAB—are marketing cars made with the green steel as “fossil-free.” And since cars and trucks also have many parts that are much more expensive than the steel they use, steel that costs the automakers a bit more adds only a little to the cost of a vehicle—perhaps a couple of hundred dollars or less, according to some estimates. Many companies have also set internal targets to reduce emissions, and buying green steel can get them closer to those goals.

Stegra’s business model is made possible in part by the unique economic conditions within the European Union. In December 2022, the European Parliament approved a tariff on imported carbon-­intensive products such as steel, known as the Carbon Border Adjustment Mechanism (CBAM). As of 2024, this law requires those who import iron, steel, and other commodities to report the materials’ associated carbon emissions. 

Starting in 2026, companies will have to begin paying fees designed to be proportional to the materials’ carbon footprint. Some companies are already betting that it will be enough to make Stegra’s 30% premium worthwhile. 

crane hoisting an i-beam  next to a steel building frame

STEGRA

Though the law could incentivize decarbonization within the EU and for those importing steel into Europe, green steelmakers will probably also need subsidies to defray the costs of scaling up, says Charlotte Unger, a researcher at the Research Institute for Sustainability in Potsdam, Germany. In Stegra’s case, it will receive €265 million from the European Commission to help build its plant; it was also granted €250 million from the European Union’s Innovation Fund.  

Meanwhile, Stegra is working to reduce costs and beef up revenues. Olof Hernell, the chief digital officer, says the company has invested heavily in digital products to improve efficiency. For example, a semi-automated system will be used to increase or decrease usage of electricity according to its fluctuating price on the grid.

Stegra realized there was no sophisticated software for keeping track of the emissions that the company is producing at every step of the steelmaking process. So it is making its own carbon accounting software, which it will soon sell as part of a new spinoff company. This type of accounting is ultra-important to Stegra, Hernell says, since “we ask for a pretty significant premium, and that premium lives only within the promise of a low carbon footprint.” 

Not for everyone

As long as CBAM stays in place, Stegra believes, there will be more than enough demand for its green steel, especially if other carbon pricing initiatives come into force. The company’s optimism is boosted by the fact that it expects to be the first to market and anticipates costs coming down over time. But for green steel to affect the market more broadly, or stay viable once several companies begin making significant quantities of it, its manufacturing costs will eventually have to be competitive with those of conventional steel.

Stegra has sold contracts for 1.2 million metric tons of steel to be produced in the next five to seven years.

Even if Stegra has a promising outlook in Europe, its hydrogen-based steelmaking scheme is unlikely to make economic sense in many other places in the world—at least in the near future. There are very few regions with such a large amount of clean electricity and easy access to the grid. What’s more, northern Sweden is also rich in high-quality ore that is easy to process using the hydrogen direct reduction method, says Chris Pistorius, a metallurgical engineer and co-director of the Center for Iron and Steelmaking Research at Carnegie Mellon University.

Green steel can be made from lower-grade ore, says Pistorius, “but it does have the negative effects of higher electricity consumption, hence slower processing.”

Given the EU incentives, other hydrogen-based steel plants are in the works in Sweden and elsewhere in Europe. Hybrit, a green steel technology developed by SSAB, the mining company LKAB, and the energy producer Vattenfall, uses a process similar to Stegra’s. LKAB hopes to finish a demonstration plant by 2028 in Gällivare, also in northern Sweden. However, progress has been delayed by challenges in getting the necessary environmental permit.

Meanwhile, a company called Boston Metal is working to commercialize a different technique to break the bonds in iron oxide by running a current through a mixture of iron ore and an electrolyte, creating extremely high heat. This electrochemical process yields a purified iron metal that can be turned into steel. The technology hasn’t been proved at scale yet, but Boston Metal hopes to license its green steel process in 2026. 

Understandably, these new technologies will cost more at first, and consumers or governments will have to foot the bill, says Jessica Allen, an expert on green steel production at the University of Newcastle in Australia. 

In Stegra’s case, both seem willing to do so. But it will be more difficult outside the EU. What’s more, producing enough green steel to make a large dent in the sector’s emissions will likely require a portfolio of different techniques to succeed. 

Still, as the first to market, Stegra is playing a vital role, Allen says, and its performance will color perceptions of green steel for years to come. “Being willing to take a risk and actually build … that’s exactly what we need,” she adds. “We need more companies like this.”

For now, Stegra’s plant—rising from the boreal forests of northern Sweden—represents the industry’s leading effort. When it begins operations in 2026, that plant will be the first demonstration that steel can be made at an industrial scale without releasing large amounts of carbon dioxide—and, just as important, that customers are willing to pay for it. 

Douglas Main is a journalist and former senior editor and writer at National Geographic.

This international surveillance project aims to protect wheat from deadly diseases

When Dave Hodson walked through wheat fields in Ethiopia in 2010, it seemed as if everything had been painted yellow. A rust fungus was in the process of infecting about one-third of the country’s wheat, and winds had carried its spores far and wide, coating everything in their path. “The fields were completely yellow. You’d walk through them and your clothes were just bright yellow,” he says.

Hodson, who was then at the UN’s Food and Agriculture Organization in Rome, had flown down to Ethiopia with colleagues to investigate the epidemic. But there was little that could be done: Though the authorities had some fungicides, by the time they realized what was happening, it was too late. Ethiopia, the biggest wheat-producing nation in sub-Saharan Africa, lost between 15% and 20% of its harvest that year. “Talking with farmers—they were just losing everything,” Hodson told MIT Technology Review. “And it’s just like, ‘Well, we should have been able to do more to help you.’”

Hodson, now aprincipal scientist at the international nonprofit CIMMYT, has since been working with colleagues on a plan to stop such losses in the future. Together with Maricelis Acevedo at Cornell University’s College of Agriculture and Life Sciences, he co-leads the Wheat Disease Early Warning Advisory System, known as Wheat DEWAS, an international initiative that brings together scientists from 23 organizations around the world.

The idea is to scale up a system to track wheat diseases and forecast potential outbreaks to governments and farmers in close to real time. In doing so, they hope to protect a crop that supplies about one-fifth of the world’s calories.

The effort could not be more timely. For as long as there’s been domesticated wheat (about 8,000 years), there has been harvest-devastating rust. Breeding efforts in the mid-20th century led to rust-resistant wheat strains that boosted crop yields, and rust epidemics receded in much of the world. But now, after decades, rusts are considered a reemerging disease in Europe. That’s due partly to climate change, because warmer conditions are more conducive to infection. Vulnerable regions including South Asia and Africa are also under threat.

Wheat DEWAS officially launched in 2023 with $7.3 million from the Bill & Melinda Gates Foundation (now called the Gates Foundation) and the UK’s Foreign, Commonwealth & Development Office. But an earlier incarnation of the system averted disaster in 2021, when another epidemic threatened Ethiopia’s wheat fields. Early field surveys by a local agricultural research team had picked up a new strain of yellow rust. The weather conditions were “super optimal” for the development of rust in the field, Hodson says, but the team’s early warning system meant that action was taken in good time—the government deployed fungicides quickly, and the farmers had a bumper wheat harvest. 

Wheat DEWAS works by scaling up and coordinating efforts and technologies across continents. At the ground level is surveillance—teams of local pathologistswho survey wheat fields, inputting data on smartphones. They gather information on which wheat varieties are growing and take photos and samples. The project is now developing a couple of apps, one of which will use AI to help identify diseases by analyzing photos.

Another arm of the system, based at the John Innes Centre in the UK, focuses on diagnostics. The group there, working with researchers at CIMMYT and the Ethiopian Institute of Agricultural Research, developed MARPLE (a loose acronym for “mobile and real-time plant disease”), which Hodson describes as a mini gene sequencer about the size of a cell phone. It can test wheat samples for the rust fungus locally and provide a result within two to three days, whereas conventional diagnostics need months.

 “The beauty of it is you could pick up something new very quickly,” says Hodson. “And it’s often the new things that give the biggest problems.”

The data from the field is sent directly to a team at the Global Rust Reference Center at Aarhus University in Denmark, which combines everything into one huge database. Enabling nations and globally scattered groups to share an infrastructure is key, says Aarhus’s Jens Grønbech Hansen, who leads the data management package for Wheat DEWAS. Without collaborating and harmonizing data, he says, “technology won’t solve these problems all on its own.”

“We build up trust so that by combining the data, we can benefit from a bigger picture and see patterns we couldn’t see when it was all fragmented,” Hansen says.

Their automated system sends data to Chris Gilligan, who leads the modeling arm of Wheat DEWAS at the University of Cambridge. With his team, he works with the UK’s Met Office, using their supercomputer to model how the fungal spores at a given site might spread under specific weather conditions and what the risk is of their landing, germinating, and infecting other areas. The team drew on previous models, including work on the ash plume from the eruption of the Icelandic volcano Eyjafjallajökull, which caused havoc in Europe in 2010.

Each day, a downloadable bulletin is posted online with a seven-day forecast. Additional alerts or advisories are also sent out. Information is then disseminated from governments or national authorities to farmers. For example, in Ethiopia, immediate risks are conveyed to farmers by SMS text messaging. Crucially, if there’s likely to be a problem, the alerts offer time to respond. “You’ve got, in effect, three weeks’ grace,” says Gilligan. That is, growers may know of the risk up to a week ahead of time, enabling them to take action as the spores are landing and causing infections.

The project is currently focused on eight countries: Ethiopia, Kenya, Tanzania, and Zambia in Africa and Nepal, Pakistan, Bangladesh, and Bhutan in Asia. But the researchers hope they will get additional funding to carry the project on beyond 2026 and, ideally, to extend it in a variety of ways, including the addition of more countries. 

Gilligan says the technology may be potentially transferable to other wheat diseases, and other crops—like rice—that are also affected by weather-­dispersed pathogens.

Dagmar Hanold, a plant pathologist at the University of Adelaide who is not involved in the project, describes it as “vital work for global agriculture.”

“Cereals, including wheat, are vital staples for people and animals worldwide,” Hanold says. Although programs have been set up to breed more pathogen-­resistant crops, new pathogen strains emerge frequently. And if these combine and swap genes, she warns, they could become “even more ­aggressive.”

Shaoni Bhattacharya is a freelance writer and editor based in London.