In this December 12, 2015 file photo, a scrap collector gathers materials in a demolished neighborhood near a chimney spewing smoke in Beijing, China. China's push for a global climate pact is partly because of its own increasingly pressing need to solve its serious environmental problems, observers said Sunday, Dec. 13, as China said the Paris deal shows it is dealing with climate change “as a responsible big country”. (Photo by Ng Han Guan/AP Photo)
