A healthy coral reef in St. Croix, U.S. Virgin Islands is shown in this undated photo provided by the U.S. National Oceanic and Atmospheric Administration. According to NOAA, some 27 percent of the world’s reefs are already gone. If current trends continue, the agency predicts another two-thirds will disappear by 2032. That’s nearly 70 percent of the world’s reefs gone in just the next 20 years.

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