More than half of the world's largest lakes are shrinking. Here's why that matters.

Water levels at Lake Powell, the nation's second-largest reservoir, remain critically low because of a climate-change driven megadrought and overuse of the Colorado River's water.Claire Harbage/NPR/NPR Human activities have caused more than half of the world's largest lakes to shrink dramatically over the last 30 years, according to a new study published in the journal Science.

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