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5d ago

Global Coral Bleaching Event Impacts 84% of Reefs, Threatening Marine Ecosystems

Scientists confirm unprecedented coral stress from rising ocean temperatures and call for urgent emission cuts and restoration efforts.

Les coraux abritent une faune immense, font vivre des millions de pêcheurs, attirent une forte activité touristique mais protègent aussi les littoraux des dégâts des tempêtes en servant de brise-lames (illustration).
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Overview

  • The fourth global coral bleaching event, ongoing since January 2023, has affected 84% of the world's coral reefs, according to the latest ICRI report.
  • NOAA data reveals that ocean temperatures in some regions have risen by up to 5°C during this period, intensifying coral stress and mortality risks.
  • Coral reefs, which support one-third of marine species and the livelihoods of a billion people, face severe threats as warming continues.
  • Projections indicate that 70–90% of corals could disappear at 1.5°C warming, with near-total loss (99%) expected at 2°C warming.
  • Global leaders and scientists emphasize the need for immediate fossil fuel reductions, large-scale reef restoration, and local measures to bolster reef resilience.