As the U.N. Climate Conference in Copenhagen enters its final week, success or failure will depend largely on an agreement between the U.S. and China.
This year China surpassed the U.S. as the largest emitter of greenhouse gas in the world. And those emissions will continue to rise dramatically over the next decade as China's economy races to catch up with the West.
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But China has promised to slow the rise of its emissions by investing massively in wind power and solar energy. Will China become the world leader in alternative energies?
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