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Jesse is on vacation until August, so this is a special, Rob-only summer episode of Shift Key.
The world uses about 30 billion tons of concrete every year — more than any other material except water. It is the most ubiquitous human-made substance in the global economy. It’s also a huge climate problem. Producing cement, which is the key ingredient in concrete, generates roughly 8% of global annual greenhouse gas emissions.
Cody Finke has a plan to change that. He is the chief executive officer and cofounder of Brimstone, a startup that says it can cheaply produce ordinary Portland cement — the kind used in construction worldwide — without carbon emissions. This week, Rob chats with Finke about why cement’s carbon emissions aren’t from fossil fuels, why there are fewer cement plants than you might think, and the all-important difference between cement and concrete.
This episode of Shift Key is hosted by Robinson Meyer, the founding executive editor of Heatmap.
Subscribe to “Shift Key” and find this episode on Apple Podcasts, Spotify, Amazon, or wherever you get your podcasts.
You can also add the show’s RSS feed to your podcast app to follow us directly.
Here is an excerpt from our conversation:
Robinson Meyer: Concrete is such an archetypal big machine problem in decarbonization. Because not only is it carbon intensive, but also — like car engines or like plane engines but, notably, unlike power plants — maybe like power plants — the technology to do it is extremely dispersed. There are hundreds of thousands of concrete plants around the world, and they all have to be replaced to decarbonize this process. It’s just a huge, huge scaling endeavor, and one that, forces you to reckon with the material implications of decarbonization in a way that, I think, it can often be easier to skip over or, just think, in the form of electricity: Oh, we can just drop new power plants in, we can build renewables. But that’s not how decarbonizing concrete will work.
Cody Finke: I would actually want to challenge that slightly.
Meyer: Perfect.
Finke: So, for many solutions, that’s the case because you’re absolutely right, there are hundreds of thousands of concrete plants. But there are not hundreds of thousands of cement plants. Cement is the binder in concrete, and for the listeners —
Meyer: Yeah, let’s actually do this because clearly I also don’t fully understand.
Finke: Concrete’s the building material. It is the most consumed material on the planet. We make 40 to 50 billion tons of it every year as humans. Concrete is sand, gravel, water, and cement — cement is the glue. Without cement, concrete would just be a pile of sand and gravel — a wet pile of sand and gravel. Cement is essential for turning that pile of sand and gravel into a pourable rock.
But cement is only about 10% of concrete — 10% to 20% — and it's made in large, centralized facilities that are located basically around big population centers. There are only 2,000 or 3,000 cement plants in the world. So it depends on your solution, right? If your solution is making a novel material, then it may require working at the concrete level, which can be good and bad. There’s a lot of those facilities, but they’re also a bit cheaper. There’s good and bad attributes of that.
But if you were to do something like what Brimstone is doing, which is making ordinary Portland cement, then what you have to do is replace those 2,000 or 3,000 cement plants, which is still a big number —
Meyer: It is still a big number, but actually not a very big number.
This episode of Shift Key is sponsored by …
Watershed’s climate data engine helps companies measure and reduce their emissions, turning the data they already have into an audit-ready carbon footprint backed by the latest climate science. Get the sustainability data you need in weeks, not months. Learn more at watershed.com.
As a global leader in PV and ESS solutions, Sungrow invests heavily in research and development, constantly pushing the boundaries of solar and battery inverter technology. Discover why Sungrow is the essential component of the clean energy transition by visiting sungrowpower.com.
Music for Shift Key is by Adam Kromelow.
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One of the largest companies in the world says its products pose catastrophic peril. Sound familiar?
This is an edition of Heatmap Daily, an evening review of the day’s news written by our executive editor. Sign up for it here.
Imagine, for a moment, a vast and growing firm — a conglomerate that could be said to define its era of American capitalism. Over the past several years, this firm’s products have become the biggest story in the U.S. economy. Its products are so mindbogglingly expensive to produce that they have driven new types of financial and infrastructural innovation, yet nevertheless the company seems to be quite profitable.
And little wonder: Everyone wants what they have. Investors, policymakers, and economists believe that America’s ongoing economic growth and competitiveness depend on ample access to this company’s products. The sitting Republican president has staked his administration on making sure Americans can get as much of it as they want — regulations be damned.
But there is a problem. One of the company’s researchers has become convinced that the company’s products are dangerous — so harmful, in fact, that their continued use and growth trajectory portends catastrophic risk for humanity. He attempts to alert the company’s executives to this fact. What happens next?
Perhaps you know the story. In the late 1970s and early 1980s, Exxon’s internal scientists concluded that the ongoing growth of fossil fuels would raise global temperatures and have “potentially catastrophic” effects on the planet’s climate. They presented these results to Exxon’s executives. A senior scientist warned that humanity had a brief window — “five to 10 years” — before “the need for hard choices regarding changes in energy strategies might become critical.”
Exxon led a large research effort into climate change, affirming its scientific validity. But then in the late 1980s, its CEO decided to go in the other direction. Its executives chose not to warn the public about climate change — and instead began a successful disinformation campaign meant to convince the public that climate change was not settled science.
But what if things had gone differently? We’re getting a taste of that pathway now. Last week, Sam Coxon, a researcher at the artificial intelligence company Anthropic, resigned because he feared the AI industry was too close to building an “out of control” intelligence. He quit his job just a few months before his corporate equity would have vested, giving up what would have likely been life-changing wealth to warn about what he believes to be existential risks. Humanity only had a brief period of time — perhaps a year — to steer the technology to a better path, he said.
Anthropic researchers who remain at the company affirmed his analysis. “We really do earnestly believe AI could kill all humans,” a senior scientist at the company posted on the social network X.
But this time, Anthropic’s CEO, Dario Amodei, did not respond as Exxon’s leadership did three decades ago. Instead, Amodei basically agreed with Coxon: He asked for the government to regulate artificial intelligence and “pace the frontier,” meaning that it should enforce a slower rate of cutting-edge artificial intelligence development.
I’ve thought of these two examples over the past few days as I’ve tried to make sense of the surge in public concern about AI and existential risk.
It seems to me that climate change is looming over the AI conversation and shaping the assumptions, outlook, and behavior of many key players and observers. President Trump, of course, is reading from the old playbook and has deemed AI to be a “hoax”; Coxon, appearing on Fox News, has downplayed climate change’s existential risk as compared to runaway AI. Yet even beyond those reruns and revisions, the analogy goes deeper: Just as nuclear non-proliferation agreements structured early attempts to regulate global greenhouse emissions, climate policy is now shaping how people understand AI risk.
And not for lack of cause. In some important ways, the problems — or alleged problems, depending on your perspective on AI — resemble each other. For instance, because technology exists in a global commons, any successful AI diplomacy must involve the United States and China. And since China’s AI development currently lags the United States, American politicians must persuade China that their proposals to regulate AI are not just concealed attempts to restrain China’s development.
This dynamic has long bedeviled climate negotiations, too. Since economic growth has (until very recently) required fossil fuels, China and other middle-income countries have long feared that any global climate treaty would constrain their future economic development. The Kyoto Protocol tried to finesse this problem by splitting countries into two groups, rich and not-rich; the Paris Agreement did it by imposing no collective restrictions on fossil fuel consumption at all.
Neither approach has worked, exactly, but each offer examples, counterexamples, and tools for thought. Perhaps the Montreal Protocol, which has successfully limited global production of the pollutants destroying stratospheric ozone — and has shown how to stop the growth of a dangerous but hard-to-manufacture technology that presents near-term existential risk — is a superior model.
There is at least one big way the two risks differ. Climate change is a chemical problem that arises from the size and scale of global fossil fuel consumption. Scientists have known that the greenhouse effect is real since the early 20th century. Climate change’s physics are rudimentary enough that Exxon’s in-house scientists could predict the path of future warming with some accuracy. It is a verifiable risk.
AI’s alleged existential risks, on the other hand, emerge from a lab pushing the technological frontier too far and drilling, like Tolkien’s dwarves, too deep. AI concern relies not on empirical observations, but on a story about exponential change and runaway growth. In this way, it’s a harder risk to predict, and a harder one to accept.
Climate advocates have long wondered what would have happened if Exxon’s leaders had embraced reality and warned the public in the 1980s that global warming is real and caused by fossil fuels. Inside Climate News once called it a “road not taken.” I can’t help but wonder if we’re watching it.
The Federal Reserve raised the federal funds rate by a quarter point, the central bank announced Wednesday afternoon, its first rate change since Chairman Kevin Warsh took his seat in May and its first rate hike in over three years.
The federal funds rate will now sit between 3.75% and 4%. According to projections by regional Federal Reserve presidents and members of the Board of Governors, the central bank expects to hike rates one more time this year.
In its now characteristically brief statements, the Federal Open Market Committee said that the hike “will support a timelier return to the Committee's 2 percent goal” for inflation. Inflation is currently running at 3.4% and has been above the Fed’s 2% target since 2021.
The FOMC’s (brief) statement explaining the hike pointed to “resilient” domestic spending and “robust” capital investment. It characterized the economy as “expanding at a solid pace,” albeit with “elevated” uncertainty due to “geopolitical developments.”
This combination of factors — high oil prices due to the partial shutdown of the Strait of Hormuz and high investment in data centers — have helped push up yields on Treasury bonds, which helped maneuver the Federal Reserve into its rate hike. These rising Treasury yields have made raising capital more difficult for sectors besides artificial intelligence, very much including the capital-intensive renewable and clean energy industries.
Warsh attributed higher Treasury yields to “economic strength, competition for capital, and geopolitics,” in his press conference following the rate announcement. The yield on the 10-year treasury bond, often used as a benchmark for the cost of money throughout the economy, rose to over 5% on the news, the highest level since 2007.
Current conditions: The fast-moving Palos Fire blazed through 17 acres in Los Angeles’ La Habra Heights, injuring two • Heavy rain in São Paulo collapsed a dilapidated building, killing six • The heat index in the Mississippi Valley is topping 110 degrees Fahrenheit.
Two weeks after accusing data center opponents of wanting “to end up being backwards and poor,” President Donald Trump has landed on a new defense of the artificial intelligence buildout. It’s a lot like his old one for abdicating on the federal government’s responsibility to deal with climate-changing emissions. Essentially, it boils down to: My critics are making it all up. “It’s a hoax,” Trump told Nvidia CEO Jensen Huang during the five-minute call the executive put on speaker on stage at a conference Monday in Los Angeles. “The robots are not going to be taking over the world. That’s not going to happen.” He later posted on his Truth Social platform: “The AI Hoax being perpetrated by the Radical Left Dumocrats is reminiscent of their Global Warming Scam of not so long ago, where everyone was going to die from extreme heat. What happened? MAKE AMERICA GREAT AGAIN!!!” Three-quarters of Americans are now opposed to data centers in their backyards, according to Heatmap Pro’s poll from last month. But Trump has recently bucked with some populist positions on technology that have cross-partisan appeal. While law-and-order Republicans in red states are now turning against the Flock cameras that watch for petty crime, Trump defended the technology in a recent Air Force One chat with reporters. “Trump deserves more respect for his anti-slopulist instincts,” Peter Meijer, a former Republican member of Congress who voted to impeach Trump during his previous administration, wrote in a post on X.
Nvidia’s emissions, meanwhile, appear to be soaring. A new Greenpeace analysis of Nvidia’s own climate reports by the pro-renewables analyst Ketan Joshi found that emissions relating to the supply chain for chip manufacturing soared by 725% since 2020, adding nearly 10 million metric tons of carbon dioxide to the atmosphere.

You wouldn’t believe some of the conditions I have heard placed on owners of hydroelectric dams seeking to relicense major clean power projects. There are obvious demands from regulators for things like new infrastructure to help migrating fish pass down a river. Then there are the less obvious, such as building an amphitheater for Boy Scouts or paving new roads far from a dam or its water source. In what the trade group called a first-of-its-kind analysis, the National Hydropower Association reviewed more than 5,000 mandatory conditions across 4,819 licensing documents filed between 1980 and 2026 in 46 states. Dam owners would need to agree to the legally binding requirements, imposed by either state or federal agencies, before a final operating license could be issued. Compared to earlier licenses, hydropower plants today “carry roughly 10 times as many mandatory conditions,” the trade association wrote in its report. “To make matters worse, many conditions are unrelated to energy production and are essentially ‘wish list’ items that hydropower producers are asked to fund, ranging from road construction unrelated to the projects to building fish passage far beyond where the fish actually are (or even could be),” the organization said. Over the next decade, 348 hydropower permits representing 12 gigawatts of capacity are due for relicensing. Many of those facilities are small, and the trend recently has been for companies to simply surrender their licenses and close up shop rather than make costly renovations.
“I urge anyone who cares about reliable, affordable power to read this groundbreaking study,” Malcolm Woolf, NHA’s top executive, said in a statement. “Hydropower, a superhero of the grid and an American icon of energy production, is at great risk due to a broken regulatory framework. Relicensing an existing hydropower facility often takes decades and costs millions of dollars. If these facilities go away, so does the affordable power they produce, the good jobs they create, and the critical infrastructure and ecosystem care they provide.”
Back in May, I told you that South Korea — arguably the most competent builder of atomic power reactors in the democratic world — was “coming to America’s nuclear rescue.” Last week, we discussed the possibility of Seoul’s state-owned nuclear company building reactors in the U.S. as part of a trade pact with the Trump administration. Now we have a clearer picture of where those negotiations may be going. On Tuesday, The Korea Economic Daily reported that South Korea is seeking a roughly 15% stake in Westinghouse, the maker of America’s flagship nuclear reactor, and a seat on its board as part of any deal with Washington. The move, the newspaper noted, is designed to “turn a U.S. request for Korean capital into a strategic foothold in America’s nuclear buildouts.” Ownership by one of America’s closest East Asian allies would be nothing new for Westinghouse, which was owned in the mid 2000s by the Japanese industrial giant Toshiba. Today Westinghouse is a privately held joint venture between the publicly traded investment behemoth Brookfield Asset Management and the Canadian uranium miner Cameco, but the company filed confidential paperwork to the Securities and Exchange Commission in July as a first step toward going public on the stock market.
The market only appears to be expanding. Global nuclear capacity could more than triple by 2060, according to this week’s latest forecast from the International Atomic Energy Agency, the United Nations affiliate that oversees nuclear technologies worldwide.
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Spend a few minutes scrolling through a comedy fan’s TikTok stream and you’ll find skits playing to the same memetic trope, an anthropomorphized caricature of an incompetent, mistake-prone AI agent guzzling and spilling lots of water. It’s no wonder the joke has already become hack. More than three-quarters of Americans are at least somewhat concerned about the environmental impact of AI, and half are extremely or very concerned, according to data from the latest annual poll from the University of Chicago’s Energy Policy Institute and the AP-NORC Center for Public Affairs Research. In every case, self-identified Democrats are more concerned about environmental issues than Republicans. While 40% of Democrats expressed concern over the environmental impacts of cryptocurrency, just 18% of Republicans said the same. With meat, the ration is 42% to 21%. With air travel, it's Democrats at 38% and Republicans at 17%. But interests converge slightly more on data centers, with 65% of Democrats and 42% Republicans extremely or very concerned about the environmental impacts of AI.
In theory, the late 20th century liberalization of America’s electricity markets should have put a premium on transmission companies building new arteries in the system. In practice, the high cost and grave risk of taking on dozens, sometimes droves, of landowners for right of way to build a power line that stretches hundreds of miles across multiple regional grids makes the task almost impossible, particularly in markets where a power company can’t offset the cost of new lines with other sources of revenue such as generation or power sales. A new report by the Center for Public Enterprise has concluded that “only the federal government can intervene to sew together this national macrogrid by bridging the jurisdictional divides between utilities and regions, instituting planning pipelines with access to finance and cost recovery, and fixing interconnection procedures.” As of yet, that looks unlikely beyond the increased focus on regional planning under the Federal Energy Regulatory Commission’s Order 1920. The rule is facing legal challenges that aren’t expected to be resolved until next year, according to Ari Peskoe, director of Harvard Law School’s Electricity Law Initiative.
When I visited Commonwealth Fusion Systems’ headquarters in Massachusetts earlier this summer, I saw how much progress the company had made toward building what could be the world’s first power-producing fusion reactor, called SPARC. To work, the interior of the torus-shaped, doughnut-like reactor needs to be very cold so magnets can pick up on the contrast in temperatures with the extremely hot plasma fusing together. That’s where the cryogenics come in. The facility’s cryogenics equipment is now up and running, the company said on Wednesday, marking yet another milestone toward next year’s anticipated start up. “That temperature, a few degrees above absolute zero, is what’ll enable our magnets to bottle up a superhot cloud of charged particles called a plasma so fusion can occur,” Adam Weiner, the director of cryogenics at Commonwealth Fusion Systems, said in a statement.