WASHINGTON (AP) - President Joe Biden convened leaders of the world's most powerful countries on Thursday to try to spur global efforts against climate change, drawing commitments from Chinese President Xi Jinping and Russian President Vladimir Putin to cooperate on cutting emissions despite their own sharp rivalries with the United States."Meeting this moment is about more than preserving our planet," Biden declared, speaking from a TV-style set for a virtual summit of 40 world leaders. "It’s about providing a better future for all of us," he said, calling it "a moment of peril but a moment of opportunity."Helen Mountford, the vice president for climate and economics at the World Resources Institute, discusses the Paris Agreement, an.