Photo: Swimmers' Sunscreen Killing Off Coral

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Normal coral (left) exposed to ultraviolet filters found in sunscreen "bleaches" white (right) when the algae living inside it die.

Up to 10 percent of coral reefs are threatened by sunscreen-induced bleaching, a new study found.

Photograph courtesy Department of Marine Science, Polytechnic University of Marche, Ancona, Italy

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