It all seemed so promising. In December 2009, U.S. President Barack Obama flew to Copenhagen to try to reach an agreement on a legally binding treaty for climate change. The sheer force of Obama's charisma and drive -- he had made climate change a top priority -- coupled with the momentum in the United States and the developed world, made a positive outcome likely: if only he could convince China, the world's biggest polluter, to cut its emissions.
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