The threat was highlighted in a study by the International Water Management Institute (IWMI) and the U.N. Food and Agriculture Organization (FAO), which estimate that Asian demand for food and livestock fodder will double in 40 years. At current crop yields, East Asia would need 47 percent more irrigated farmland and to find 70 percent more water, the study found.

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Source: http://news.nationalgeographic.com/news/2009/08/09