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World leaders will descend on Copenhagen from Dec. 7 to Dec. 18 to negotiate a global climate change treaty. But analysts predict that after years of haggling over a successor to the Kyoto Protocol, the two-week summit will be a tough slog. Western countries want emerging economies such as India and China to agree to carbon emissions reductions, while the developing world says big polluting countries in the West should shoulder most of the cuts. Nongovernmental organizations, industry trade associations, and other climate change campaigners also have specific demands, which could further complicate negotiations.

Who will be making the key decisions at Copenhagen? Click on to see which politicians, campaigners, and industry leaders will be making waves during the climate change summit.