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84% of Coral Reefs Bleach Amid Record Heat Crisis

4/29/2025

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Summary

Story summary

A staggering 84% of the world's coral reefs suffered bleaching from January 2023 to March 2025, affecting 82 countries. This unprecedented fourth global coral bleaching event highlights the urgent threat to coral ecosystems, with 2024 marking the hottest year on record, intensifying the peril of marine heat stress.

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Story summary

A staggering 84% of the world's coral reefs suffered bleaching from January 2023 to March 2025, affecting 82 countries. This unprecedented fourth global coral bleaching event highlights the urgent threat to coral ecosystems, with 2024 marking the hottest year on record, intensifying the peril of marine heat stress.