2017-03-26nationalgeographic.com

In the coming decades this slow-speed crisis will unfold just as the world needs to increase food production by 60 percent, according to the United Nations, to feed more than nine billion people by mid-century.

The draining of North America's largest aquifer is playing out in similar ways across the world, as large groundwater basins in Asia, Africa, and the Middle East decline rapidly. Many of these aquifers, including the southern Ogallala, have little ability to recharge. Once their water is gone, they could take thousands of years to refill.



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