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Colorado River tops new list of most endangered American rivers

The Colorado River, which provides drinking water to more than 40 million Americans, has become the country’s most endangered river amid rising temperatures and punishing drought conditions, a new report has found.

Climate change, coupled with outdated water management, poses an ongoing threat to the lifeblood of the Mountain West — a waterway that serves 30 federally recognized tribal nations, seven U.S. states and Mexico, as well as some 30 native fish species and 400 types of birds, according to the report.

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