FILE - This Nov. 26, 2012 file photo shows organizers on stage at the opening ceremony of the 18th United Nations climate change conference in Doha, Qatar. The amount of heat-trapping pollution the world spewed rose again last year by 3 percent. So scientists say it's now unlikely global warming can be limited by more than a couple degrees, which is an international goal. (AP Photo/Osama Faisal, File)
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