In 2006, China passed the United States as the world's top emitter of greenhouse gases; last year it exceeded U.S. investment in clean energy for the first time, with a total of $34.6 billion. Driving that investment are air pollution, which has reached choking levels in Chinese cities, and a strong desire to meet a voracious appetite for energy through domestic sources. Not only is the country adding nuclear, hydroelectric, wind, and solar power at an unrivaled pace, but it's fast becoming a proving ground for next-generation energy technologies that have stalled elsewhere.
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