In the doomsday scenario of the world’s climate modelers, every leader acts a bit like Donald Trump. Resurgent nationalism breeds regional conflicts and competitiveness. Security concerns prompt countries to retreat inward. Global development slows and inequality festers, while cooperation on energy and food security goals withers. Major countries such as the US abdicate leadership on climate action as emissions rise, and temperatures soar to searing levels.

Technically, it’s known as the Shared Socioeconomic Pathway 3 (SSP3), just one of many models published by scientists in 2016 to game out different futures, and included for the first time in reports developed for the Intergovernmental Panel on Climate Change (IPCC). But in casual conversation, many climate scientists simply call it “Trump World.”

“The biggest climate impact is not in the highest warming world,” says Zeke Hausfather, a climate scientist at the…

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