Tom Steyer is a hedge-fund billionaire who made his money investing in distressed assets, including fossil fuel projects. He’s also an avowed climate activist and a major donor to US politicians seeking to tackle climate change. After a short-lived run for president, Steyer in 2021 set up Galvanize Climate Solutions, a firm that invests in companies and technologies promising emissions reductions this decade. It recently raised $1 billion.

Zero host Akshat Rathi spoke with Steyer at COP28 in December, to ask why he got out of fossil fuels, the consequences of bad carbon accounting, and what the return of Donald Trump would mean for global climate ambitions.

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What Donald Trump’s return means for US climate ambition

Zero: The Climate Race

What Donald Trump’s return means for US climate ambition