In his first hours in the White House after his inauguration; He began his term, on Wednesday evening, by signing 15 executive measures that canceled some of the policies set by President Donald Trump, including the return of the United States to the Paris climate agreement, and the revocation of the presidential permit granted to the controversial oil pipeline (Keystone XL).

Biden also canceled the travel ban imposed by Trump on some Muslim-majority countries, and called for the promotion of the "Deferred Action for Childhood Arrivals" program, or the so-called "Dreamers" program, for immigrants who came to the United States as children.

It ended the national emergency declaration that was the basis for diverting some federal funds to build a wall along the US-Mexico border.

The Secretary-General of the United Nations, António Guterres, hastened to "warmly" welcome Biden's decision to return the United States to the Paris climate agreement, calling on the new American president to set his country "new ambitious goals" in this area to be implemented over the next ten years. "I warmly welcome President Biden's steps to return to the Paris Agreement to combat climate change and to join the growing coalition of governments, cities, states, companies and individuals that are taking ambitious measures to confront the climate crisis," he said in a statement.

He added, "We look forward to leading the United States to accelerate global efforts" to "achieve carbon neutrality" by proposing a new national contribution with ambitious targets for 2030. "