Australia Barrier Reef Bleaching

FILE - In this December, 1999, file photo, tourists snorkel around Upolu Cay on the Great Barrier Reef near Cairns off the Australian north east coast. An aerial survey of the Great Barrier Reef shows coral bleaching is sweeping across the area off the east of Australia for the third time in five years. Bleaching has struck all three regions of the world’s largest coral reef system and is more widespread than ever, scientists from James Cook University in Queensland state said Tuesday, April 7, 2020. (AP Photo/Brian Cassey, File)