Trickling rivers and sinking lakes are the most visible examples that the availability of water has passed its peak while demand still grows. The worst threat to water supplies is the overuse of underground reservoirs. Some 30 percent to 40 percent of the world's food is irrigated with groundwater from once-ample aquifers that took millennia to fill. These irreplaceable deposits are being depleted in a matter of decades, leaving behind withering tomato fields in Mexico's Baja California and dusty plains in central India.
Bloomberg article on the Water market
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