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Chinese visit a tourist spot shrouded in fog, caused by air pollution, in Linfen, Shanxi province, China, Sunday, Dec. 6, 2009. Delegates converged Sunday for the grand finale of two years of tough, sometimes bitter negotiations on a climate change treaty, as U.N. officials calculated that pledges offered in the last few weeks to reduce greenhouse gases put the world within reach of keeping global warming under control. (AP Photo/Andy Wong) Andy Wong / AP Photo