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The 2023–2025 global coral bleaching event is an ongoing environmental disaster that represents the most extensive coral bleaching incident in recorded history, affecting approximately 84% of the Earth's coral reef ecosystems. Announced by the International Coral Reef Initiative (ICRI) in April 2025, the event was the fourth global bleaching event officially documented, and surpassed the previous 2014–17 event, which impacted roughly two-thirds of global reefs. Coral reefs in the territories of at least eighty-two nations suffered enough thermal stress to undergo bleaching.
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