Half of the World’s Coral Reefs Suffered Severe Bleaching During 2014–2017 Global Marine Heatwave
An estimated half of the world’s coral reefs experienced significant bleaching during the 2014–2017 global marine heatwave, according to a major international study led by researchers at the Smithsonian Tropical Research Institute (STRI). The findings, published in Nature Communications, represent the most geographically extensive analysis of coral bleaching ever conducted.
The study concludes that more than 50% of coral reefs worldwide suffered substantial bleaching during what scientists call the “Third Global Coral Bleaching Event,” with approximately 15% experiencing significant coral mortality.
Researchers warn that a fourth global bleaching event, which began in 2023, is already underway.
Coral reefs provide enormous benefits to society, supporting fisheries, tourism, coasta...









