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Global warming poses threat to Southwest water supply

Desert Sun: The biggest reservoir in the United States is dropping 1 foot each week. Lake Mead's rapidly sinking water level is set to reach an all-time low in July, driven down by a 14-year drought that scientists say is one of the most severe to hit the Colorado River in more than 1,200 years. The water behind Hoover Dam supplies vast areas of farmland and about 25 million people in three states, and this critical reservoir stands just 40 percent full. Droughts and even decades-long mega-droughts have...