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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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    AM Briefing

    Solar Megaproject Goes Dark

    On the Chevy Bolt’s return, China’s rare earth crackdown, and Nestle’s spoiled climate push

    Trump Kills Nevada’s Behemoth Solar Megaproject
    Heatmap Illustration/Getty Images

    Current conditions: A possible nor’easter is barreling toward New York City with this weekend with heavy rain, flooding, and winds of up to 50 miles per hour • While Hurricane Priscilla has weakened to a tropical storm, it’s still battering Baja California with winds of up to 70 miles per hour • A heatwave in Iran is raising temperatures so much that even elevations of more than 6,500 feet are nearly 90 degrees Fahrenheit.

    THE TOP FIVE

    1. Trump cancels Nevada’s largest solar megaproject

    The Bureau of Land Management has canceled Nevada’s largest solar megaproject, Esmeralda 7, Heatmap’s Jael Holzman scooped late Thursday. The sprawling network of panels and batteries in the state’s western desert was set to produce a gargantuan 6.2 gigawatts of power — equal to nearly all the power supplied to the southern part of the state by the state’s main public utility. At maximum output, the project could have churned out more power than the country’s largest nuclear plant, the nearly 5 gigawatts from Plant Vogtle’s four reactors in Georgia, and just under the nearly 7.1-gigawatt Grand Coulee hydroelectric dam in Washington, the nation’s most powerful electrical station. It would have been one of the largest solar projects in the world.

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    Sparks

    Esmeralda 7 Solar Project Has Been Canceled, BLM Says

    It would have delivered a gargantuan 6.2 gigawatts of power.

    Esmeralda 7 Canceled
    Heatmap Illustration/Getty Images

    The Bureau of Land Management says the largest solar project in Nevada has been canceled amidst the Trump administration’s federal permitting freeze.

    Esmeralda 7 was supposed to produce a gargantuan 6.2 gigawatts of power – equal to nearly all the power supplied to southern Nevada by the state’s primary public utility. It would do so with a sprawling web of solar panels and batteries across the western Nevada desert. Backed by NextEra Energy, Invenergy, ConnectGen and other renewables developers, the project was moving forward at a relatively smooth pace under the Biden administration, albeit with significant concerns raised by environmentalists about its impacts on wildlife and fauna. And Esmeralda 7 even received a rare procedural win in the early days of the Trump administration when the Bureau of Land Management released the draft environmental impact statement for the project.

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    Electric Vehicles

    The Chevy Bolt Is the Cheap EV We’ve Needed All Along

    It’s not perfect, but pretty soon, it’ll be available for under $30,000.

    The Chevy Bolt.
    Heatmap Illustration/Chevrolet, Getty Images

    Here’s what you need to know about the rejuvenated Chevrolet Bolt: It’s back, it’s better, and it starts at under $30,000.

    Although the revived 2027 Bolt doesn’t officially hit the market until January 2026, GM revealed the new version of the iconic affordable EV at a Wednesday evening event at the Universal Studios backlot in Los Angeles. The assembled Bolt owners and media members drove the new cars past Amity Island from Jaws and around the Old West and New York sets that have served as the backdrops of so many television shows and movies. It was star treatment for a car that, like its predecessor, isn’t the fanciest EV around. But given the giveaway patches that read “Chevy Bolt: Back by popular demand,” it’s clear that GM heard the cries of people who missed having the plucky electric hatchback on the market.

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    Green