This increasing private irrigation is depleting groundwater resources, a threat to water sustainability, according to “Revitalizing Asia’s Irrigation: To sustainably meet tomorrow’s food needs,” a 2009 report by the United Nations Food and Agriculture Organization (FAO) and the International Water Management Institute (IWMI). Furthermore, without improvements in irrigation efficiency, much of the water being brought to the surface evaporates or soaks into the ground before making it to crops.

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