The United States returned to the Paris Climate Agreement just 107 days after leaving it.
The US officially joined the agreement on Friday, almost a month after President Joe Biden told the UN that he intended to return.
Biden signed a decree on his first day in office, overturning the decision of his predecessor, Donald Trump.
The Trump administration announced its withdrawal from the Paris Agreement in 2019, but due to the terms of the agreement, the decision did not come into effect until November 4, 2020, the day after the election.
UN Secretary General António Guterres said Thursday that America’s official return is “very important in itself,” as is Biden’s announcement that the US will once again begin providing climate assistance to poorer countries as promised in 2009.