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An El Niño is forecast for 2023. How much coral will bleach this time?

Scientists remember the years between 2014 and 2017 as a particularly bad time for coral reefs. Elevated temperatures fueled by an El Niño climate pattern harmed about three-quarters of the world’s reefs in both hemispheres, forcing corals to release their life-sustaining zooxanthellae and turning them ghostly white in a process known as coral bleaching. 

About 30% of the world’s corals died as a result of this bleaching. Others have yet to fully recover.

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