Supplied image of Researcher Grace Frank completing bleaching surveys along a transect line on an area known as One Tree Reef, in the Capricorn Group of Islands, on the Great Barrier Reef in Australia

Supplied image of researcher Grace Frank completing bleaching surveys along a transect line on an area known as One Tree Reef, in the Capricorn Group of Islands, on the Great Barrier Reef in Australia, made available to Reuters on November 29, 2016. Picture watermarked from source. Tory Chase/Courtesy of ARC Centre of Excellence for Coral Reef Studies/Handout via REUTERS