"President Biden on Thursday moved to put four years of official climate denial behind the United States, declaring that America would cut its global warming emissions at least in half by the end of the decade."

"President Biden's climate summit will gather three dozen leaders from countries with their own motivations related to domestic politics, international trade and, sometimes, altruistic intentions toward global warming."

"In movies such as Contagion, a pandemic begins in a flash. A deadly virus spills over from an animal, like a pig, into humans and then quickly triggers an outbreak."

"President Biden this week will pledge to slash U.S. greenhouse gas emissions at least in half by the end of the decade, according to two people briefed on the plan, as part of an aggressive push to combat climate change at home and persuade other major economies around the world to follow suit."

"Joe Biden faces a key test of his commitment to climate action this week, when he sets out his core plans for tackling the climate crisis and calls on all of the world’s major economies to join him in bold action to slash greenhouse gas emissions in the next ten years."

"When President Joe Biden convenes a virtual climate summit on Thursday, he faces a vexing task: how to put forward a nonbinding but symbolic goal to reduce greenhouse gas emissions that will have a tangible impact on climate change efforts not only in the U.S. but throughout the world."

"The United States and China vowed late Saturday to work together in coming months to combat climate change “with the seriousness and urgency that it demands,” a move that signaled a rare collaboration even as they clash over trade frictions, China’s harsh treatment of Uyghurs and a crackdown on pro-democracy activists in Hong Kong."