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Climate

Last Summer Was the Hottest in 2,000 Years

On historical heat data, clean hydrogen, and solar geoengineering

Last Summer Was the Hottest in 2,000 Years
Heatmap Illustration/Getty Images

Current conditions: Wildfires continue to burn out of control in western Canada • An early season heat wave will bring record high temperatures to parts of Florida • One in eight Europeans now live in an area at risk of flooding.

THE TOP FIVE

1. Study: Last summer was the hottest in 2,000 years

We already know that last summer was the hottest “on record” – but those records only really go back to the 1850s or so. A new study published in the journal Nature looks further into the past and concludes that last summer was the warmest in some 2,000 years in the Northern Hemisphere. To reach this conclusion, researchers examined thousands of tree rings, which offer clues about a year’s temperature and moisture levels. The tree ring data suggests last summer was about 4 degrees Fahrenheit warmer than the average temperature of the years 1 AD to 1890 AD. The study warns that summer 2024 could be even warmer than 2023.

A separate study out yesterday concluded that Southeast Asia’s intense April heat wave was fueled by man-caused climate change. In the Philippines, for example, a 15-day heat wave pushed the heat index to 113 degrees Fahrenheit, disrupting daily life and forcing many schools to close. This extreme weather would have been “impossible” without climate change, the study found.

2. House Democrats launch probe into Trump’s meeting with Big Oil execs

House Democrats have launched an investigation into a recent Mar-a-Lago dinner where former President Donald Trump reportedly asked Big Oil bosses to put $1 billion toward his 2024 presidential campaign and promised to roll back some environmental rules should he win back the White House. The House oversight committee sent letters to oil executives from Cheniere Energy, Chesapeake Energy, Chevron, Continental Resources, EQT Corporation, ExxonMobil, Occidental Petroleum, Venture Global and the American Petroleum Institute. They want the companies to list who attended the meeting, provide copies of any documents distributed, describe any policies that were discussed, and disclose any contributions made to Trump’s campaign during or after the dinner, according to The Washington Post. The top Democrat on the committee, Rep. Jamie Raskin, gave the executives a deadline of May 27 to turn over information, but the committee’s investigative powers are limited by the GOP’s control of the House. “If the oil companies decline to turn over the information, Democrats will not be able to subpoena the firms, stymying their investigation,” explained the Post.

3. Trump chides Biden on new Chinese EV tariffs

President Biden confirmed yesterday that he is imposing a 100% tariff on Chinese-made electric vehicles, as well as tariff increases on other clean energy technologies including lithium batteries, solar cells, and critical minerals. Former President Trump, speaking from outside the New York courtroom where his hush money trial is taking place, said: “Where have they been for three-and-a-half years? They should have done it a long time ago.”

There is no equivalence between Biden’ tariffs and the 10% across the board tariff on all imported goods from all countries that Trump has proposed, wrote Heatmap’s Robinson Meyer. “Biden’s new tariffs focus on certain strategic sectors that American officials believe the country must cultivate to stay at the technological frontier, coupled with pre-existing subsidies meant to spur domestic production of those goods. Some of the tariffs only kick in beginning in 2026 — far enough in the future, policymakers hope, for the market to prepare. Trump’s tariffs, meanwhile, would intentionally and chaotically hike prices.”

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  • 4. DOE offers Plug Power $1.66 billion conditional loan for green hydrogen plants

    The Department of Energy yesterday offered Plug Power a conditional commitment of $1.66 billion in loan guarantees to build up to six clean hydrogen plants that use the company’s electrolyzer technology. The hydrogen would “power fuel cell-electric vehicles used in the material handling, transportation, and industrial sectors, resulting in an estimated 84% reduction in greenhouse gas emissions compared to conventional hydrogen production,” the DOE announcement said. Most hydrogen production uses fossil fuels to run an electrolyzer that splits water into hydrogen and oxygen. But clean hydrogen relies on electrolyzers powered by renewable sources – or natural gas with carbon capture. The Biden administration sees clean hydrogen as a key part of its push to decarbonize heavy industry. The deal isn’t done yet – Plug will have to prove its projects will benefit local communities and “satisfy certain technical, legal, environmental, and financial conditions” before the loan goes ahead. But the news sent Plug’s stock soaring nonetheless.

    5. California officials pause solar geoengineering study over safety concerns

    In case you missed it earlier this week (I did!), officials in California have ordered researchers to stop using an aerosol sprayer to test a potential solar geoengineering process for cooling the planet, The New York Times reported. The Cloud Aerosol Research Instrument, or CARI, sits on the flight deck of the Hornet, a decommissioned aircraft carrier in Alameda, California. It sprays sea salt aerosol particles into the air, a process that could one day be used to brighten clouds and reflect the sun’s rays. This experiment, which began in early April, marked the first time such a device had been tested outdoors in the U.S. But the city of Alameda told the scientists to stop their research until the health and environmental impacts of the experiment can be evaluated. “The city is evaluating the chemical compounds in the spray to determine if they are a hazard either inhaled in aerosol form by humans and animals, or landing on the ground or in the bay,” city officials said.

    THE KICKER

    Police in the U.K. could soon carry “Ghostbusters-style devices” that use electromagnetic rays to stop e-bike engines if a rider is suspected of being involved in a crime.

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    Daily Briefing

    Microsoft’s Climate Pollution Surged 25% Last Year

    Plus, the Trump administration appointed a new “beacon of rational thought.”

    Microsoft offices.
    Heatmap Illustration/Getty Images

    We got a look at another major tech company’s latest energy and carbon emissions data — and it’s a doozy. On Wednesday, Microsoft released its annual sustainability report, giving us another year’s worth of energy and emissions data for a company that Heatmap’s annual insiders poll once judged to be one of the best hyperscalers for climate change.

    The headline: Microsoft’s climate pollution surged last year. Its carbon emissions increased 25% year-over-year, the biggest single-year rise since at least the pandemic. The company emitted the equivalent of 21 million tons of carbon dioxide in 2025, under standard measurement methods. (It emitted slightly less under its own bespoke measurement system, which counts fuel credits and customer energy use differently.)

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    Spotlight

    Meta’s Bacterial Mystery Could Poison the Data Center Well

    Water pollution in Wyoming has big implications for the future of data center development.

    A data center and water pollution.
    Heatmap Illustration/Getty Images

    Did a Meta data center introduce a rare, dangerous bacteria into the sewers system of Wyoming’s capitol city? It’s an environmental pollution mystery with an answer that could decide the future of American AI infrastructure development.

    Our drama begins in Cheyenne, Wyoming, where the city’s board of public utilities just wrapped up a lengthy investigation into the presence of Cupriavidus gilardii, a potentially lethal bacteria resistant to heavy metals, in the city’s wastewater treatment systems. Apparently, in February, board staff detected the contamination and shut off public access to the city’s water reuse system, a supply of treated non-potable water fed with treated wastewater and used for lawns, athletic fields, and other green spaces. Officials were worried that spraying this water could release into the environment a bacteria found to cause fatal health outcomes in immunocompromised or elderly people who are infected by it.

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    Q&A

    How Big of a Problem Is Data Center Noise?

    A conversation with Ross Marchard of the Taxpayers Protection Alliance

    The Q&A subject.
    Heatmap Illustration

    This week’s conversation is with Ross Marchard, executive director for the Taxpayers Protection Alliance, a center-right advocacy group that focuses on what it sees are onerous policies potentially hindering responsible collection and use of tax dollars. TPA’s position on AI clearly skews pro-free market, as they’ve recently defended Anthropic from Trump administration attacks. TPA also recently took on the mantle of defending data centers from noise complaints, publishing a paper on Tuesday “debunking myths about data centers being excessively noisy.” The paper references various analyses of data centers by state legislators and local regulators to argue that claims the sector is generally noisy are false.

    I asked TPA’s executive director to chat with me about why and how the organization will try to quell these fears. The conversation was really interesting so I decided to share it with you in full, sans light editing for clarity and consistency.

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