An undated handout photo received from ARC Centre of Excellence for Coral Reef Studies on April 19, 2018 shows a mass bleaching event of coral on Australia's Great Barrier Reef. The Great Barrier Reef suffered a “catastrophic die-off” of coral during an extended heatwave in 2016, threatening a broader range of reef life than previously feared, a report revealed on April 19, 2018. / AFP PHOTO / ARC Centre of Excellence for Cor / MIA HOOGENBOOM

One third of Great Barrier Reef corals killed in marine heatwave in 2016

Coral bleaching occurs when high water temperatures cause corals to expel the algae, making the coral pale or white

Topic |   Climate change

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An undated handout photo received from ARC Centre of Excellence for Coral Reef Studies on April 19, 2018 shows a mass bleaching event of coral on Australia's Great Barrier Reef. The Great Barrier Reef suffered a “catastrophic die-off” of coral during an extended heatwave in 2016, threatening a broader range of reef life than previously feared, a report revealed on April 19, 2018. / AFP PHOTO / ARC Centre of Excellence for Cor / MIA HOOGENBOOM
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