China's President may well surprise many Americans at the opening of the UN's all day Climate Summit Tuesday morning by announcing voluntary and sweeping policy measures to fight global warming. Over coffee and mini-Danish Monday morning in midtown Manhattan, chief UN climate negotiator Yvo De Boer told a small group of journalists that the expected announcement "could well make China a world leader on climate change."

President Obama is also expected to speak at the Summit's opening -- his first speech ever to the United Nations, and his first major speech on global warming as president.

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