At Least 36 U.S. States Face Water Shortage

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Rising temperatures due to global warming have increased evaporation rates across the country and reduced the availability of important water sources. One of these is the Sierra Nevada snowpack, which supplies a significant portion of California's water. Across the West, similar trends are expected to reduce flows of the Colorado River, which supplies water for seven states.

Meanwhile, rising sea levels are expected to cause saltwater to infiltrate freshwater aquifers in coastal states, rendering that water unusable.

California uses about 23 trillion gallons of fresh water per year. The United States as a whole uses more than 148 trillion gallons for all purposes, including agriculture, manufacturing and other uses.

Other threatened regions include the Midwest, where the Great Lakes are shrinking, and upstate New York, where reservoir levels have fallen to record lows. Georgia's crisis has already arrived, and Florida's is expected to hit soon.

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