About 40 million people get water from the Colorado River. Studies show it's drying up.
PHOENIX Scientists have documented how climate change is sapping the Colorado River, and new research shows the river is so sensitive to warming that it could lose about one-fourth of its flow by 2050 as temperatures continue to climb.
Scientists with the U.S. Geological Survey found that the loss of snowpack due to higher temperatures plays a major role in driving the trend of the rivers dwindling flow. They estimated that warmer temperatures were behind about half of the 16% decline in the rivers flow during the stretch of drought years from 2000-2017, a drop that has forced Western states to adopt plans to boost the Colorados water-starved reservoirs.
Without changes in precipitation, the researchers said, for each additional 1.8 degrees of warming, the Colorado Rivers average flow is likely to drop by about 9%.
The USGS scientists considered two scenarios of climate change. In one, warmer temperatures by 2050 would reduce the amount of water flowing in the river by 14-26%. In the other scenario, warming would take away 19-31% of the rivers flow.
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