84% of the world's coral reefs hit by worst bleaching on record
The world is in the midst of its 4th and largest global coral bleaching event, impacting around 84% of the world's coral reefs, scientists confirmed. Coral bleaching was documented in at least 83 countries and territories from January 1, 2023, to April 20, 2025. During the 3rd global coral bleaching event from 2014-2017, 68.2% of world's coral reefs were impacted.