Supplied image of dead table corals killed by bleaching on Zenith Reef, on the northern Great Barrier Reef in Australia, made available to Reuters on November 29, 2016. Greg Torda/Courtesy of ARC Centre of Excellence for Coral Reef Studies/Handout via REUTERS    ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. EDITORIAL USE ONLY. NO RESALES. NO ARCHIVE. THIS PICTURE WAS PROCESSED BY REUTERS TO ENHANCE QUALITY. AN UNPROCESSED VERSION WILL BE PROVIDED SEPARATELY. - RTSTR6I