In recent months, China has taken center stage in the international debate over global warming. It has surpassed the United States as the world's largest source of greenhouse gases, and it became developing nations' diplomatic champion at the recent United Nations climate negotiations in Bali.

The focus on China intensified late last year, when new data from the International Energy Agency and other research organizations revealed that China had overtaken the United States as the largest source of greenhouse gases—and, more ominously, that its emissions are growing at a rate that exceeds all wealthy nations' capacity to decrease theirs.

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