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IF THE TWENTIETH CENTURY was the era of the megadam and the ecological destruction of the world's rivers, the twenty-first century could be different. It could. But will it?
In a modest ceremony in Beijing in April 2003, a small bottle of water was presented to the city's vice-mayor, Niu Youcheng. To an outsider it didn't seem like much-a variant on some ancient Chinese tea ceremony, perhaps. But its significance for the future of a city of 14 million people, the capital of the world's largest country, could be profound.
The water had come from the Danjiangkou Reservoir, a huge man-made expanse of water more than 1,000 km to the south on a tributary of the Yangtze River, the world's fourth-largest river. Its arrival in Beijing symbolized the start of what China is calling the biggest engineering project ever undertaken anywhere on the planet. It is a scheme to
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