New scientific research shows that human-caused climate change is putting the most densely populated areas of the Northern Hemisphere, including the American West, at risk of losing vast portions of their water supply because of decreasing snowpack.

Published in the journal Nature, the report led by two Dartmouth College researchers found climate change-driven snowpack trends in half of the 169 river basins in the Northern Hemisphere, 31 of which they said they could “confidently attribute to human influence.”

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