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New York (AP) - After the exit under ex-President Donald Trump, the USA is now officially part of the Paris climate agreement again.
At dawn on Friday on the US east coast, the United States returned to the historic treaty of 2015, according to the UN.
The Secretary General of the United Nations, António Guterres, described the US step on Thursday as a “key moment” on the move towards more sustainable climate protection.
He also praised the strengthening of US climate policy carried out by the administration of the new President Joe Biden, which also includes the reversal of some steps by the Trump administration.
Biden had initiated the return to the climate agreement as one of his most pressing tasks right on his first day at work on January 20 - a 30-day deadline had expired on Friday to complete the re-entry.
Under Trump, the US officially withdrew from the UN agreement to limit climate change at the beginning of November.
The United States has the second highest greenhouse gas emissions in the world after China, with significantly fewer inhabitants.
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Biden says he wants America to be a leading nation in the fight against global warming.
To do this, he made the former US Secretary of State John Kerry a political heavyweight as the White House's special envoy to the climate.
Kerry and Guterres are due to attend an event to mark the US re-entry into the treaty on Friday.
The aim of the Paris Agreement is to limit climate change to well below two degrees.
So far, however, the states' plans for saving greenhouse gases are by no means sufficient to achieve this.
© dpa-infocom, dpa: 210219-99-504571 / 3