Corals are dying across the planet. The culprit? Ever-increasing temperatures are stressing out corals' colorful partners called zooxanthellae. The result? Bleached-white corals. Now, scientists with the National Oceanic and Atmospheric Administration (NOAA) have found the stressful conditions are expanding from Hawaii into the Caribbean. Because of the breadth and severity of the bleaching, NOAA scientists have declared a "global coral bleaching event," only the third such declaration on record. Here's a look at what's happening beneath the world's seas.
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