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As Warren Buffett prepares to hand over the keys to Berkshire Hathaway, today’s newsletter looks at the climate credentials of his conglomerate. You can also read and share this story on Bloomberg.com. For unlimited access to climate and energy news, please subscribe

Buffett’s complicated climate legacy

By Brian Eckhouse

Warren Buffett will exit the CEO chair at Berkshire Hathaway Inc. later this year with a complicated climate legacy.

The Omaha-based investor runs a conglomerate that is a clean energy heavyweight, with wind and solar assets across the US, and he has written that climate change is “highly likely” a “problem for the planet.” Yet Berkshire is also a major investor in oil, gas and coal — a position poised to endure well after the 94-year-old retires.

Buffett has been opportunistic, said Ethan Zindler, who leads country and policy research at BloombergNEF. “He’s obviously one of the world’s most legendary investors because he sees opportunities. Some have been climate-coincidental, and some have not.”

Berkshire, of course, has invested in solar and wind. Its MidAmerican Energy Co. built a big portfolio of wind farms to help power Iowa and parts of nearby states. Those turbines were responsible for more than 60% of the utility’s generation capacity last year.

Over the weekend at Berkshire’s annual shareholder meeting, Greg Abel — Buffett’s anointed successor and the company’s energy boss — highlighted $16 billion in renewables investments in Iowa to retire five coal units. But he added that five other such units were still needed “to keep the system stable. We cannot have a Spain-Portugal situation.” The crowd applauded.

While Buffett has written about the risks of climate change, Berkshire has over the past decade made investments in Occidental Petroleum Corp. and Chevron Corp. despite fossil fuels being a major driver of greenhouse gas emissions. The company also made a deal for Dominion Energy Inc.’s gas assets in mid-2020. It was a contrarian bet at a time when the presidential candidacy of climate-minded Joe Biden was ascendant.

Edward Jones analyst Jim Shanahan surmised then that Berkshire wanted “to be bigger in renewables, but it’s going to take time.” The Dominion deal was “a bet that the future doesn’t come as fast as some people think.”

Read More: Clean No Longer Tops Agenda for Utilities, Exelon CEO Says

Berkshire isn’t alone in that regard: ESG investing has fallen out of favor while fossil fuels have regained some traction. The war in Ukraine underscored the importance of energy security — and the AI boom is driving a surge of new electric demand, which has led some power companies to extend the lives of old and dirty coal-fired plants.

“It doesn’t seem like ESG investing is too high a priority on their list,” Matthew Palazola, an analyst at Bloomberg Intelligence, said on Monday of Berkshire. “They would view energy as a necessity for society.”

During the annual meeting Saturday, Abel said the company works with states on the paths they want to chart — and plans that honor federal standards. Berkshire didn’t respond to a request for comment.

Greg Abel, center, during a shareholders shopping day ahead of the Berkshire Hathaway annual meeting in Omaha, Nebraska, in 2022. Photographer: Dan Brouillette/Bloomberg

In 2022, Abel touted Berkshire’s businesses as “exceptionally well positioned to deliver on ever-changing customer expectations regarding sustainability.” It was months before Biden signed the Inflation Reduction Act, the landmark US climate law.

But things have changed markedly since. The introduction of ChatGPT signaled the arrival of the AI era, which upended expectations for power demand. And Donald Trump’s return to the White House triggered a prompt overhaul of federal climate policy toward fossil fuels. 

Still, Berkshire is not immune to the impacts of climate change. In its 2024 report released in February, the company preliminary estimated its insurance group could incur pre-tax losses of approximately $1.3 billion from the wildfires that ravaged Southern California in January — events that were  made more likely by global warming

Climate change is an increasing risk for insurers, which gives Buffett’s successor a new problem to handle. Abel has been vice chairman of Berkshire’s non-insurance operations, but as CEO he will oversee all corners of the company. 

In his annual letter to shareholders in February, Buffett noted that property-casualty insurance pricing strengthened during 2024, “reflecting a major increase in damage from convective storms.”

“Climate change may have been announcing its arrival,” he wrote. “Someday, any day, a truly staggering insurance loss will occur — and there is no guarantee that there will be only one per annum.”

— With assistance from Mark Chediak and Alexandre Rajbhandari

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Getting on track

30%
This is how much Berkshire Hathaway has set out to reduce greenhouse gas emissions from its BNSF Railway by 2030, compared with a 2018 baseline.

Seen to be green

"It has a tremendous signaling effect."
Jim Shanahan
Edward Jones analyst
Shanahan was commenting in 2022 on the decision to have Greg Abel give a breakdown of Berkshire Hathaway's sustainability endeavors in its annual report.

More from Green

President Donald Trump’s campaign to wind back the climate agenda of his predecessor belies a continued commitment in the US to the clean-energy transition, according to Bill Gates.

Unwinding global collaborations to address climate change “works against us,” Gates said at Temasek Holdings Pte.’s Ecosperity Week conference in Singapore on Monday. The expectation is that the current pushback will subside, “maybe not overnight,” he said. But “there’s a lot of commitment to this cause in the United States.”

The Trump administration has taken a wrecking ball to green policies in the US, pledging to turbocharge coal, oil and gas production, while moving to slash international spending on global climate initiatives. That’s on top of Trump’s decision to once again withdraw the US from the Paris climate agreement. 

“This current trend, where there’s a little less cooperation going on, I don’t think that’s a permanent thing,” Gates said. 

Bill Gates, chair of the Gates Foundation, speaks during a fireside chat at an ATxInspire event in Singapore, on Tuesday, May 6, 2025.  Photographer: Ore Huiying/Bloomberg

Firm that turns CO2 into rock secures new funding. Clean-tech startup Exterra Carbon Solutions raised C$20 million ($14.5 million) from several investors, another milestone for a Canadian company that has signed an early-stage agreement with chemicals giant BASF SE.

Credits tied to shutting Asia coal plants win backing. A form of carbon credits intended to channel more private capital toward the early phase out of coal-fired power plants has been endorsed by a key standards body.

The UK is collecting less green tax money. The government is taking in  less revenue from green taxes than at any point since records began 28 years ago, according to the Office for National Statistics. Environmental tax burdens have been shifting toward industry over the last decade as the government has sought to protect households from rising costs.

Worth a listen

Last week Canadians elected Mark Carney, leader of the Liberal party, to be their prime minister. Carney is a newcomer to politics, but is well known in international finance and climate circles, running both the Bank of Canada and the Bank of England, and founding the Glasgow Financial Alliance for Net Zero (GFANZ). Canada is far from reaching its legally mandated goal to achieve net zero by 2050, and has one of the highest emissions per capita of anywhere in the world. Now Carney has been elected, can he translate his international climate leadership into domestic policy, or will climate fall by the wayside as he fortifies Canada against a trade war with the US?

Bloomberg Green senior reporter and former Toronto Bureau Chief, Danielle Bochove, joins Zero to discuss. Listen now, and subscribe on AppleSpotify, or YouTube to get new episodes of Zero every Thursday.

Mark Carney Photographer: David Kawai/Bloomberg

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