Half of the world’s coral reefs suffered major bleaching during the 2014–2017 global heat wave, estimates suggest

Benefits to society from coral reefs, including fisheries, tourism, coastal protection, pharmaceutical discovery and more, are estimated at about $9.8 trillion per year. For the first time, an international team led by Smithsonian researchers estimated the extent of coral bleaching worldwide during a global marine heat wave, finding that half of the world’s reefs experienced significant damage. Another heat wave began in 2023 and is ongoing.

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