This file photo released by the Hawaii Department of Land and Natural Resources shows coral being studied for bleaching, which is a stress response that causes corals to lose algae and color from their tissue, in Kaneohe Bay near Kaneohe, Hawaii. Mass 'bleaching' of Hawaii's corals is a blow to the state's fragile reefs which are already under pressure from runoff from development on land and overfishing. Some activists call coral bleaching 'the most visible sign of climate change'.

Coral Bleaching. (2015, February 5). Manila Bulletin, p. B8.