What is happening to the world's coral reefs and can they be restored?
Coral reefs are dying at an unprecedented rate, but ingenious restoration efforts offer a fragile thread of hope.
The answer
In 2024, NOAA confirmed the fourth global coral bleaching event in history, with over 77% of the world's reef areas experiencing bleaching-level heat stress. Australia's Great Barrier Reef recorded its worst mass bleaching ever, spanning over 1,000 kilometers. Corals expel symbiotic zooxanthellae algae when water exceeds 1-2°C above summer maximums, turning white and starving. Restoration efforts include coral gardening, where fragments are grown on underwater nursery trees then transplanted - Coral Restoration Foundation has outplanted over 200,000 corals in the Florida Keys. Scientists are also breeding heat-resistant 'super corals' through assisted gene flow and using 3D-printed reef structures.
Source: National Oceanic and Atmospheric Administration
- coral reefs
- climate change
- ocean conservation
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