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Senior rangers in the Great Barrier Reef region are seen during an inspection of the reef's condition. (Photo by David Gray/Reuters)

Serious threat imperils coral reefs

More than one-third of the world's coral reefs this year are at risk from some level of bleaching — an effect that can whiten and kill coral as ocean temperatures rise — researchers from groups including the National Oceanic and Atmospheric Administration said Thursday.Reefs around Hawaii, Haiti, the U.S. Virgin Islands and Puerto Rico are...

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