Chinese officials are fond of grandiose engineering projects. After more than a decade of toil, one of the biggest since the construction of the Great Wall is close to achieving what they like to call a "decisive victory". In coming months, canals and pipelines hundreds of kilometres long will bring water from the Yangzi River basin to the parched north. But growing demand is forcing officials to look for other sources. A promising one, they believe, is the sea.
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