What we know so far about COVID-19 variants worldwide

Diy13/iStockBy DR. SEAN LLEWELLYN, ABC News (NEW YORK) — Scientists around the world are on the lookout for new COVID-19 variants, which are caused by mutations of the virus when its replication machinery makes an error. Experts

Biden to sign executive order on climate change

MANDEL NGAN/AFP via Getty ImagesBy STEPHANIE EBBS and SARAH KOLINOVSKY, ABC News (WASHINGTON) — On his one-week anniversary in office, President Joe Biden is scheduled to sign an executive action on tackling the climate crisis. Biden’s actions

Biden's UN envoy pick to vow tough stance on China, greater US engagement

Mark Makela/Getty ImagesBy CONOR FINNEGAN, ABC News (WASHINGTON) — Linda Thomas-Greenfield, President Joe Biden’s nominee to be U.S. ambassador to the United Nations, faces her Senate confirmation hearing Wednesday, vowing to bring back “genuine, old-fashioned, people-to-people diplomacy,”