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In second grade, I dressed up as Rachel Carson for a school project on heroes. My mom, a flight attendant, had petitioned me to be Amelia Earhart, but as an aspiring veterinarian/zookeeper, all it took was learning that Carson had saved the bald eagles!!! for me to make up my mind.
In truth, Amelia Earhart never stood a chance. Environmentalism was everywhere in the 1990s and early 2000s when I was growing up. I became obsessed with endangered animals after learning about them on the back of Welch jam jars; I stuffed a World Wildlife Fund-branded leopard plushie during a birthday party at Build-a-Bear and adopted an Orca for Christmas; and during a fifth-grade unit on the tropical rainforest, I was outraged to learn that bad guys were cutting it down.
Concerns about nature and conservation were my primary entry points into the climate movement when I got older, though at a certain point, I stopped openly calling myself “an environmentalist.” It wasn’t really a conscious choice.
But in setting out this week to write about how the original Earth Day movement — which, at its inception in 1970, involved one in 10 Americans — dwindled into what it is today, a corporate greenwashing bonanza, I now believe my abandonment of the “environmentalist” label is indicative of something more significant, a shift in the movement’s public identity. Earth Day and by extension, environmentalism, used to be cool, as Liza Featherstone reminded readers in The New Republic last year; the movement, for a time, occupied a sweet spot of being both “radical and mainstream.” But somewhere along the line, environmentalism lost its edge.
Many autopsies have been conducted on the modern environmental movement, some more literal than others. It’s easy to forget now, though, that environmentalism was once very much alive. Silent Spring, published in 1962, helped heighten Americans’ awareness of environmental issues (in addition to work by other oft-overlooked grassroots activists); an oil spill off Santa Barbara, California, in 1969, subsequently helped galvanize them. In the aftermath, Wisconsin Democratic Senator Gaylord Nelson organized nationwide “teach-ins” about environmental issues, picking the date of April 22, 1970, when college students would be on spring break. By the time the first Earth Day arrived, though, some 20 million Americans showed up for events and marches around the country, helping make it the biggest single-day protest in human history.
What followed was the golden age of environmentalism. “In May 1971, fully a quarter of the public thought that protecting the environment was important,” up from a mere 1% two years earlier, the Environmental Protection Agency’s website recounts. The EPA itself was created out of that momentum; Congress also passed the Clean Water Act, the Endangered Species Act, and the lesser-known Federal Insecticide, Fungicide, and Rodenticide Act — a Carson throwback that regulated pesticides. Sierra Club and Greenpeace memberships skyrocketed.
The momentum carried into the 1980s: victims of industrial pollution successfully lobbied Congress to pass the Superfund law to clean up toxic sites; the “Save the Whales” campaign achieved a global moratorium on commercial whaling; and in 1988, NASA scientist Dr. James Hansen warned Congress that it was “99% certain that the [planet’s] warming trend was not a natural variation but was caused by a buildup of carbon dioxide and other artificial gases in the atmosphere.”
By then, though, industry, business, and conservative politicians had begun to mobilize a quiet counterattack. In the provocative 2004 essay “The Death of Environmentalism,” Breakthrough Institute founders Michael Shellenberger and Ted Nordhaus cite a market research survey that found the number of Americans who agreed with the statement “we must accept higher levels of pollution in the future [in order to preserve jobs]” increased from 17% in 1996 to 26% in 2000, while the number of Americans who believed “most of the people actively involved in environmental groups are extremists, not reasonable people,” increased from 32% to 41% over the same years.
Meanwhile, the environmental movement was undertaking a long overdue self-examination. “When the Sierra Club polled its members, in 1972, on whether the club should ‘concern itself with the conservation problems of such special groups as the urban poor and ethnic minorities,’ 40% of respondents were strongly opposed, and only 15% were supportive,” The New Yorker writes in a history of the racist roots of the environmental movement (which, it should be noted, go back further and deeper than the original Earth Day). By the 1990s, activists were calling out the fact that minorities made up less than 2% of the combined employees at the top environmental groups in the country. Modern environmentalism has never managed to fully shake the ensuing criticism that it is a white person’s cause.
The narrowness of the environmental movement’s vision also hindered its ability to adapt to the new political landscape. Adam Werbach, an ex-president of the Sierra Club, wrote in his own 2004 postmortem of the movement that while it was perhaps necessary to “package seal pups, redwoods, clean air, Yosemite, clean water, and toxic waste under the brand of ‘environmentalism’ in order to pass a raft of environmental laws in the 1970s,” for “at least 20 years and maybe longer, the basic categorical assumptions that underlie environmentalism have inhibited the environmental movement’s ability to consider opportunities outside environmental boundaries.” Jenny Price, the author of Stop Saving the Planet: An Environmentalist Manifesto, expressed a similar sentiment more recently to Grist: “The environment is not just ‘out there,’” she explained, even though environmentalism has often treated the natural world as a separate “thing” that needs to be saved. Environmentalism is also, though, “our food, the wood in our houses, and the metals in our computers.”
But the real reason environmentalism lost its edge might be that it actually became too mainstream. In the late 1960s, almost no one thought protecting the environment was important; today, nearly three-quarters of Americans say they worry about the environment and four in 10 say they are environmentalists. Businesses jostle to be labeled the “greenest” and “most sustainable”; oil companies brazenly attempt to brand themselves as good for the Earth. Even former President Donald Trump has nonsensically insisted on the 2024 campaign trail that he is an environmentalist.
At the same time, environmentalism is no longer centralized enough to notch policy wins, and professed commitment to the cause flags when it becomes inconvenient or costly; it is human consumption, after all, that is “the primary driver of environmental problems,” as Magali A. Delmas and David Colgan write in The Green Bundle: Pairing the Market with the Planet. Many environmentalists are fair-weather fans; concern about the environment tends to go up when concerns about the economy go down, and vice versa; support wanes once Americans are asked to burden the cost. Still, environmentalism’s core ideas — that our surroundings matter and need protection — have become entrenched cultural values, even if only in spirit.
At the same time, a breakaway wing of the environmental movement has begun pushing back on the more traditional and conservationist faction. In an essay that begins with the words “I’m an environmentalist,” Bill McKibben recently argued in Mother Jones for building out “lots of solar panels and wind farms and battery arrays,” even if and when it requires “aesthetic” intrusions into the natural world. Longtime Sierra Club member and author Rebecca Solnit has also made a surprising, and similar, argument in favor of mining lithium and cobalt, which “will be an inevitable part of building renewables.” Yes, mining will have an environmental cost, but it’s one that realistically “needs to be weighed against the far more devastating impact of mining for and burning fossil fuel.”
This is not yet a mainstream viewpoint, though. Four in every five Americans say conserving local land and wildlife is more important than building new sources of renewable electricity, even if that means slowing down the world’s response to climate change, a Heatmap Climate Poll found.
It’s ironic that the environmental movement might have been so successful that it sometimes blocks the action required to save the places it professes to love. Admittedly, the new branch isn’t likely to inspire first graders to dress up as wind turbines for class projects, and solar farms aren’t likely to have branded partnerships with teddy-bear-making workshops.
But it’s new. It’s bold. It’s exciting. You might even call it edgy.
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SoftBank’s error and Nvidia’s scandal suggest data centers may have already peaked as an economic and energy trend.
This is Heatmap Daily, a weekday digest written by our executive editor. Subscribe here.
Covering energy and climate change sometimes means seeing certain stories in a different light than others. And a particularly vivid hue illuminated The Wall Street Journal’s report today that the Japanese conglomerate SoftBank Group is taking a $3.7 billion loss on several gigawatts’ worth of natural gas turbines.
For the Journal, the big news is that SoftBank and its billionaire founder, Masayoshi Son, are failing to capitalize on the artificial intelligence boom. But at Heatmap, we’re thinking about the turbines.
The data center boom and the return of electricity load growth has depleted the world’s supply of natural gas turbines. SoftBank had purchased reservations for about 13 gigawatts of turbines, according to the Journal. That’s a staggering amount of electricity — it could meet New York City’s maximum power draw on the hottest part of a summer’s day. The conglomerate now seems set to dump reservations for about four gigawatts’ worth. Keeping a reservation, it turns out, really is harder than making it.
Most of those rotors were reportedly from GE Vernova, one of the world’s largest producers of gas turbines. GE Vernova’s order list for gas turbines has been filled for nearly two years and the waiting list now stretches into 2031. That has led data center developers, hungry to get power as soon as possible, to reach for ever dirtier forms of electricity generation, including diesel generators and even old jet engines.
On that front, SoftBank’s failure to sell the turbines to a higher bidder suggests (albeit weakly) that demand for energy-producing assets might not be as strong as the AI boom’s backers once thought. SoftBank was already set to send about 9 gigawatts of turbines to the enormous Trump-backed OpenAI data center in Pike County, Ohio. The roughly remaining four gigawatts will be released back their manufacturers. (One thing this news can’t quite tell us, alas, is what type of turbine set-up will be used in the Pike County facility, which will be the world’s largest gas-fired power plant if it is build to completion. Recent public filings have suggested the facility isn’t planning on using any turbines in the more efficient combined-cycle configuration, which would mean the plant’s carbon intensity will be worse than most other new natural gas plants. But we’d love to hear any tips on this front.)
To zoom out for a second, I’m struck by how the AI bubble has been replaced by an AI muddle. As I wrote this, news emerged that Nvidia is preparing to fire its CEO, Jensen Huang, for his affair with a Chinese woman who is alleged to be a spy. (He had at least one more affair with another Nvidia executive, according to The New York Times.) Under Huang’s leadership, Nvidia has invested in a sprawling and sometimes circular network of energy-related companies, including Emerald AI, a startup that helps data centers flex their electricity consumption, and Redwood Materials, a battery recycler and producer led by the former Tesla executive J.B. Straubel. Huang has used Nvidia’s enormous balance sheet to buy down the risk of other AI and AI-related companies, propelling the overall AI trade to become the biggest story in American markets.
Now that balance sheet is in peril: Nvidia’s stock is already down 11% over the past five days, and it has fallen another 8% in after-hours trading since news broke of Huang’s ouster. If the chip designer’s financial network began to fray — or even if the next CEO had a lower risk appetite than Huang — then its demise could impact a much larger set of firms.
Even before the Huang scandal broke, companies at the center of the AI trade were showing signs of weakness. Alphabet, Meta, and Microsoft are all down on the month. Nvidia was already lagging by about 10% on the month before its hebdomas horribilis began, too. The memory and chip makers Micron and Applied Materials are both down more than 25% in about the same period, and GE Vernova and Oklo have fallen nearly 20%. Although the data center company Coreweave rebounded on an earnings beat today, it’s still down 24% on the month and nearly 50% since May.
The market rout isn’t total — Anthropic seems likely to enjoy one of the largest IPOs ever in the next week (although perhaps not with quite as large a valuation as its investors once imagined). And the underlying technology of AI seems to be getting worryingly better all the time. But even though the politics of data centers and AI seem set to dominate the new Washington, I’m wondering if data centers as a mainstream economic trend might have already peaked. Americans voted for a more subdued AI boom in the midterms. Now it seems like they might get it ahead of schedule.
Lunar Energy’s latest AI-powered system aims to integrate EVs into the automated demand response mix.
In theory, it’s straightforward to assemble the smart energy home: Solar panels, home backup batteries, and electric vehicles, plus smart thermostats, heat pumps, and water heaters — all the individual pieces can be had for the homeowner who can afford the up-front cost. The challenge is getting all those pieces to talk to one another.
Bay Area-based Lunar Energy is one of the tech firms that’s been trying to crack this problem. Today, it announced an upgraded version of its artificial intelligence-powered home energy control system, which not only integrates all those separate systems but also responds tactically to energy markets. CEO Kunal Girotra told me Lunar AI saves its users money by monitoring their home 24/7 and making decisions to charge, not to charge, or discharge so that they save the most money.
“Utilities are all moving to almost-real-time changes of rates,” he said. “You need software to handle that for you. I think that the race is on for who has the best AI machine learning algorithms to save the most amount of money. And so far, we seem to have a head start.”
Lunar’s first-generation system focused on generation, storage, and control. In other words, it connected elements like a home’s rooftop solar panels with the backup battery the residents might keep in the garage, using the AI to decide when to meet the home’s real-time energy needs with solar versus grid energy versus stored power. What it didn’t have was the ability to work with electric vehicles to manage charging and use the car’s battery as a bonus source of energy.
To fix this, Lunar has built its own bidirectional EV charger — one that can charge up the battery or discharge the car’s battery for a secondary use, like backing up the home’s power supply. Girotra, formerly the head of Tesla Energy, told me the problem with that functionality to this point has been the connection point between the car and the home electrical system. Carmakers and other companies in the space didn’t have the deep experience with electrical certifications to make the process seamless, he tells me. That led to setups like the original Ford Charge Station Pro, which required several different wall-mounted electrical boxes to connect the F-150 Lightning EV to the home.
Lunar’s charger is built to connect to its customers’ existing home Lunar energy system, which includes a microgrid interconnect device they call Lunar Bridge that islands the home in case of a power outage on the grid. In that way, the power stored in the EV battery is ready to back up the home in case of a blackout without any additional work — or to be optimized as part of a fully smart home that’s making money as part of a virtual power plant.
The company’s setup allows for another fun feature: “slow” charging that’s not slow at all, but actually two or three times as fast as the Level 2 charging most EV owners use to recharge their batteries overnight. Electric cars in the U.S. can typically take on only about 11 kilowatts of AC power from one’s home because of the limitations of their on-board hardware. Because Lunar’s system is fully DC, however, Girotra said the company decided to build a DC home charger, one that — like a Tesla Supercharger or other DC fast chargers out in the world — isn’t limited by that power cap. Lunar said it could use a combination of power from the grid, home solar, or home batteries to charge an EV at up to 25 kilowatts. That’s enough to recharge an EV in three to four hours rather than six to eight.
“If the standards get high, and if everybody sees cars can get charged in three hours, then all of a sudden people are like, ‘Wow, this is how I want it,’” he said. “Especially for 25% of the users who are like me, who always are running low on charge and they don’t mind a boost every now and then.”
Some of the other improvements in the second-gen system are more incremental. An inverter that’s 40% more powerful helps Lunar get its system up to enterprise scale. That’s crucial, as the world moves toward a place where more homes and businesses employ battery backup systems. Lunar’s new batteries come in modular 5 kilowatt-hour blocks ranging from 10 kilowatt-hours to 30 kilowatt-hours in a single unit and scale up to 300 kilowatt-hours for home or small commercial use; there’s also new pad-mounted configurations with capacity up to 1 megawatt-hour.
Batteries, though, are the simple part. Everyone from EV makers like Rivian to utilities like Octopus Energy is racing to make a person’s or a business’s batteries and solar panels and electric cars work for them, using the power of AI to account for moment-to-moment changes in energy prices and supply. Lunar’s new tech makes the case that the most important element is a single brain to integrate every last smart, electrified thing in your house.
The fundraise comes on the heels of a $50 million grant from the Department of Energy.
Almost all lithium-ion batteries on the market rely on graphite for their anodes, more than 90% of which is processed in China. That concentration has created a chokepoint in the Pentagon’s supply chain as the military increasingly turns to batteries to help its transportation network operate more quietly and reduce reliance on complex refueling logistics.
So when Congress passed the latest National Defense Authorization Act at the end of 2025, barring Chinese-linked battery materials from military use starting in 2028, Coreshell saw an opening. While the California-based silicon-anode battery startup had previously focused on automakers as its beachhead customers, it’s now shipping its first battery cells to the military for use on Navy ships and Army ground vehicles. On Wednesday, Coreshell announced a $30 million Series B to scale up manufacturing operations to meet the needs of this growing customer base.
“We’re entering a new stage where we’re no longer, I would say, demand limited,” Coreshell’s CEO Jonathan Tan told me. “This year we’ve had to put on second and third shifts, work nights and weekends, just to get the product out the door.”
Coreshell sets itself apart by going a step further than the NDAA requires. The law doesn’t make suppliers trace battery materials all the way back to the mine, which would be exceedingly difficult given China’s dominance across the battery supply chain. But Coreshell has nevertheless eliminated Chinese sourcing from its anodes by replacing graphite with silicon mined and refined in the U.S. by Ferroglobe, one of its Series A investors.
Ferroglobe and global investment firm Access Industries led the latest round, with defense contractor ADS also joining as a new strategic investor. The financing comes on the heels of a $50 million Department of Energy grant that Coreshell secured in August as part of a program to strengthen the domestic battery supply chain. That funding will support the company’s first commercial-scale facility, a 2-gigawatt-hour factory.
That’s about 20 times the size of the 100-ish-megawatt-hour plant the startup had originally envisioned, as the DOE grant has allowed Coreshell to “expand much further than we were originally expecting,” according to Tan. The company is now evaluating several potential U.S. sites and expects to announce its selection early next year. For now, it relies on unnamed contract manufactures, along with its small pilot line in San Leandro, to produce its cells. But once the gigafactory gets up and running, the startup plans to bring electrode production in house by 2028, followed by full cell assembly in 2029.
Building this plant will ultimately require significant additional capital. But Tan believes this latest vote of confidence from the federal government will help Coreshell to diversify its capital stack as it continues to fundraise. “That’s one of the great things about having such a notable DOE award is that it also allows us to attract multiple forms of capital,” he told me.
Silicon has long been recognized as a promising alternative material for battery anodes, as it can store far more energy than graphite. The catch is that it tends to swell during charging, causing it to break down quickly and ultimately leading to a much shorter cycle life. Coreshell says it’s extended its anode’s lifespan by giving it a proprietary coating, which Tan told me back in April essentially means “painting the inside of your battery” with an ultra-thin protective layer.
Other companies, such as Sila Nanotechnologies and Group14 Technologies, are also working to commercialize silicon anodes. But Coreshell says many of its competitors rely on more highly engineered, expensive forms of silicon, such as silane gas. By contrast, Coreshell uses metallurgical silicon, a cheap, raw commodity already widely used in aluminum alloys. That, Tan argues, gives the company a cost advantage not only over its competitors, but potentially Chinese graphite too.
Coreshell hasn’t yet demonstrated that its cells can meet the performance demands of the automotive industry, however. When the company raised its Series A in early 2025, it said it expected its automotive cells to exceed 1,000 charge cycles while retaining 80% of their original capacity. But Tan told me many defense applications don’t require such demanding performance targets, as Navy ships and ground vehicles are “not intending to have as many miles or missions or use cases on that same battery” as a consumer EV would.
That doesn’t mean the company is abandoning its automotive ambitions. As Tan pointed out, electric vehicles remain by far the largest source of global and domestic battery demand. “It’s natural for us to obviously utilize the security supply chain first,” he told me. “That allowed us to really get to commercialization, revenue, and production faster, because automotive qualification is this longer journey. But ultimately, we want to do both of those and more.”