FILE – In this April 16, 2013 file photo, a "bathtub ring" marks the high water mark as a recreational boat approaches Hoover Dam along Black Canyon on Lake Mead, the largest Colorado River reservoir, near Boulder City, Nev. Scientists say global warming may already be shrinking the Colorado River and could reduce its flow by more than a third by the end of the century. (AP Photo/Julie Jacobson, File)
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