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Chinese skylines are defined by construction cranes and the din of jackhammers. China produces 50 percent of the world's cement [ pdf ]--the next largest producer, India is responsible for just 6 percent--to build seemingly endless tracts of high rises, railroads, parking lots, highways, airports and shopping malls.

China's energy use should flatten out sometime around 2030, with a similar leveling off of its greenhouse gas emissions, a federal researcher said yesterday.