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This photo provided by the XL Catlin Seaview Survey, taken in February 2015, shows coral after bleaching in American Samoa, when the XL Catlin Seaview Survey responded to a NOAA coral bleaching alert. Devastating bleaching of colorful coral is spreading into a rare worldwide crisis, scientists announced, predicting it will likely get worse. Triggered by global warming and El Nino, record hot ocean water is causing the fragile coral to go white and often die, threatening picturesque reefs that are hotspots of marine life, experts say. (Credit: AP)

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