FILE - A solar panel installation is seen in Ruicheng County in central China's Shanxi Province. The last two agreements the world made to battle climate change came only after the United States and China, by far the two biggest carbon polluters, made deals with each other. Now the successful dynamic is in jeopardy with China cutting off climate talks with the U.S. because of House Speaker Nancy Pelosi’s trip to Taiwan. (AP Photo/Sam McNeil, File)