This undated handout photo received on April 6, 2020 from the ARC Centre of Excellence for Coral Reef Studies at James Cook University, shows an aerial survey of coral bleaching on the Great Barrier Reef. Australia's Great Barrier Reef has suffered its most widespread coral bleaching on record, scientists said on April 7, 2020 in a dire warning about the threat posed by climate change to the world's largest living organism. James Cook University professor Terry Hughes said a comprehensive survey last month found record sea temperatures had caused the third mass bleaching of the 2,300-kilometre (1,400-mile) reef system in just five years.
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 / AFP / JAMES COOK UNIVERSITY AUSTRALIA / Handout / TO BE USED EXCLUSIVELY FOR AFP STORY AUSTRALIA-ENVIRONMENT-CLIMATE-REEF
RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO / JAMES COOK UNIVERSITY" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS - NO ARCHIVE
This undated handout photo received on April 6, 2020 from the ARC Centre of Excellence for Coral Reef Studies at James Cook University, shows an aerial survey of coral bleaching on the Great Barrier RShow more

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