Advertisement Washington: Within hours of his inauguration, US President Joe Biden returned the US to the international Paris Agreement to fight climate change, the centrepiece of a raft of day-one executive orders aimed at restoring US leadership in combating global warming. The announcements also included a sweeping order to review all of former President Donald Trump's actions weakening climate change protections, the revocation of a vital permit for TC Energy's Keystone XL oil pipeline project from Canada, and a moratorium on oil and gas leasing activities in the Arctic National Wildlife Refuge that Trump's administration had recently opened to development.