https://www.scientificamerican.com/article/here-are-all-the-climate-actions-biden-took-on-day-one/

U.S. climate policy hung a U-turn yesterday, with President Biden using his Inauguration Day to launch a domestic and international response to climate change that is diametrically opposed to that of his predecessor.

The new administration marked the day by rejoining the Paris climate agreement, revoking the Keystone XL oil pipeline’s federal permit and pledging to “review” a laundry list of Trump administration regulatory actions aimed at propping up high-emitting industries.