President Biden on Wednesday took action to have the U.S. rejoin the Paris climate accord, following through on a campaign pledge to recommit to the Obama-era agreement on his first day in office.

The move reverses former President Trump’s withdrawal from the pact. For several months, the U.S. was the only country in the world that wasn’t a party to the accord.

“A cry of survival comes from the planet itself, a cry that can’t be any more desperate or any more clear,” Biden said in his inaugural address, listing “a climate in crisis” as one of the many challenges facing the U.S.

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Biden has described the renewed commitment as a down payment on his climate plan, which calls for putting the country on a path to net-zero emissions by 2050.

Rejoining takes little more than a letter from Biden, but the U.S. will be recommitting to the Paris agreement at a time when other countries have begun rolling out more ambitious climate goals.

Special envoy John Kerry will be leading much of the administration’s efforts, shepherding the U.S. through a United Nations conference set for November in Scotland, where countries will formally adopt more stringent climate commitments.

Read more at The Hill.