FILE - In this Dec. 3, 2009 file photo, a Chinese boy cycles past a cooling towers of a coal-fired power plant in Dadong, Shanxi province, China. President Barack Obama's proposal to curb U.S. greenhouse gas emissions might improve the chances of completing a global climate treaty but is unlikely to defuse demands by China, India and others for Americans to do more. China, the biggest emitter, has promised to curb its output but with its economy slowing, and communist leaders under pressure to generate jobs, has resisted binding limits. (AP Photo/Andy Wong, File)