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FILE--This June 2007, file aerial photo shows Midway Atoll, one of the farthest in the string of the Northwestern Hawaiian Islands with long stretches of pristine atolls and coral reefs. Nearly half of the Hawaii's coral reefs were bleached during heat waves in 2014 and 2015 and fisheries close to shore are declining, a group of scientists told state lawmakers. (Burl Burlingame, Honolulu Star-Bulletin via AP, file)