Great Barrier Reef loses record 25-31% of coral cover due to 2024's extreme marine heatwaves.

The Great Barrier Reef suffered its largest single-year coral loss ever recorded in 2024, with two-thirds of the reef losing about 25-31% of its coral cover due to mass coral bleaching triggered by extreme marine heatwaves. Nearly half of the reef lost coral, while only 10% saw an increase. The reef's recovery is threatened by frequent marine heatwaves, cyclones, and extreme weather events. Experts stress the need to reduce greenhouse gas emissions to help the reef recover.