Widespread Mussel Die-Offs Worry Scientists

December 29, 2019 03:54 AM
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Scientists are scrambling to understand why thousands of dead mussels are turning up in several rivers across the United States and Europe, including one of the world's biodiversity hotspots. Experts worry that the rapid decline of mussels in Appalachia's Clinch River may be a sign of a worldwide die-off of the important water cleaners. VOA's Steve Baragona has more.