The 2023–2025 global coral bleaching event has affected 84% of the world’s coral reefs, marking the most extensive bleaching incident in recorded history.

The ongoing 2023–2025 global coral bleaching event has become the most extensive on record, impacting approximately 84% of the world’s coral reef ecosystems. Elevated ocean temperatures, primarily due to anthropogenic climate change, have led to widespread bleaching across at least 82 nations. Regions such as the Pacific coast near Mexico have reported coral mortalities up to 93%, while some areas in Florida have experienced complete die-offs. The Great Barrier Reef is undergoing its fifth extensive bleaching event since 2016. This mass bleaching threatens marine biodiversity, fisheries, and coastal protection, with scientists warning of increased coastal erosion and vulnerability to storms. The event underscores the urgent need for global action to mitigate climate change and protect marine ecosystems.