U.S. to rejoin Paris climate accord; Biden works to overturn Trump's climate policies Juliet Eilperin, Steven Mufson and Brady Dennis, The Washington Post Jan. 20, 2021 FacebookTwitterEmail 3 1of3The sun sets over Bears Ears National Monument in Utah.Washington Post photo by Katherine Frey.Show MoreShow Less 2of3Gina McCarthy, an appointee for deputy national climate adviser to President-elect Joe Biden, says the executive orders aim to "move forward in combating the climate crisis." She is photographed Dec. 19, 2021, in Wilmington, Del.Washington Post photo by Jonathan NewtonShow MoreShow Less 3of3 WASHINGTON - During his first moments in the Oval Office on Wednesday, President Joe Biden moved to return the United States to the Paris climate accord and directed federal agencies to begin unraveling Donald Trump's environmental policies - the first step in what Biden has vowed will be a sustained effort to safeguard the nation's air and water, protect endangered species and combat climate change at home and abroad.