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"In their search for renewable electric power, China's engineers have been building mega-dams at a rate unmatched in human history. Many far larger than the Hoover Dam on the Colorado River - which is 221 meters high and capable of generating more than 2,000 megawatts of power - are being constructed on China's greatest rivers. Best known is the Three Gorges Dam, completed in 2008, which stretches a mile-and-a-half across the Yangtze and can generate ten times the hydropower of the Hoover Dam. Yet the Three Gorges is only a fraction of China's current dam programme. "