Rare optimism ahead of climate talks in Lima

Energized by new targets set by China and the United States, the world's top climate polluters, U.N. global warming talks resume Monday with unusual optimism despite evidence that human-generated climate change is already happening and bound to get worse. Negotiators from more than 190 countries will meet in the Peruvian capital for two weeks to work on drafts for a global climate deal that is supposed to be adopted next year in Paris.

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