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Environment & Climate

UN advisers assess nearly all shallow-water coral reefs at risk of collapse by 2075

The Guardian reports that an IUCN-coordinated UN nature assessment finds about 24% of reefs already critically endangered, rising to 96% with expected heating impacts.

Updated Oct 22, 2026 · 16:18 UTC3 reports

The short version

  • The Guardian reports that UN nature advisers assess nearly all shallow-water coral reefs at high risk of ecosystem collapse before 2075.[The Guardian]
  • About 24% of reefs across more than 80 countries are already critically endangered, rising to 96% with expected global heating impacts.[The Guardian]
  • The IUCN-coordinated assessment covers 127 reef regions but did not fully account for the 2023–2025 mass bleaching event.[The Guardian]

Key facts

  • An assessment by UN nature advisers finds almost every shallow-water coral reef faces a high risk of ecosystem collapse before 2075 due to global heating.[The Guardian]
  • About 24% of reefs across more than 80 countries are already critically endangered, rising to 96% when expected global heating impacts are included.[The Guardian]
  • The assessment analysed 127 coral reef regions and was coordinated by the International Union for Conservation of Nature.[The Guardian]
  • The assessment did not fully account for the 2023 to mid-2025 fourth global mass bleaching event, which the US government's Coral Reef Watch has confirmed was the most widespread on record.[The Guardian]

What remains uncertain

  • The 2075 collapse risk is an assessed projection from an expert review, not an observed outcome.[The Guardian]
  • Because the assessment did not fully account for the 2023 to mid-2025 bleaching event, its findings may not capture that event's full impact.[The Guardian]

Sources

Outlet counts describe coverage, not independent confirmation. Reports may share a wire service or original source.