U.S. President Joe Biden on Wednesday recommitted the United States to the Paris climate agreement, the international accord designed to avert catastrophic global warming, and ordered federal agencies to start reviewing and reinstating more than 100 environmental regulations that were weakened or rolled back by former President Donald Trump.

The moves represent a first step in healing one of the deepest rifts between the United States and the rest of the world after Trump defiantly rejected the Paris pact and seemed to relish his administration’s push to weaken or undo major domestic climate policies.

Biden has elevated tackling the climate crisis among his highest priorities. In addition to curbing global warming, he has vowed that ending the coronavirus pandemic, restoring the economy and addressing racial injustice will be the central causes of his administration.