Great Barrier Reef Suffers Worst Annual Coral Decline in 39 Years
QUEENSLAND, AUSTRALIA, AUG 5 – The 2024 bleaching event caused a 30% coral decline in the southern Great Barrier Reef, marking the largest annual loss ever recorded, driven by climate change and other environmental stressors.
- On August 6, 2025, the Australian Institute of Marine Science’s report warned the Great Barrier Reef suffered its most widespread bleaching on record after surveying 124 reefs between August 2024 and May 2025.
- Amid escalating climate pressures, the Great Barrier Reef experienced its most extensive bleaching due to climate change-induced heat stress, tropical cyclones, and crown-of-thorns starfish, last year.
- Along the southern branch, coral cover declined from 38.9% to 26.9%, nearly one third, due to climate change-driven bleaching.
- Coral scientists warn that recovery could take years and depends on future coral reproduction and minimal environmental disturbance, Dr Mike Emslie said.
- Amid the reef’s decline, Mr Richard Leck, WWF, warned some reefs are beyond recovery and urged rapid greenhouse gas emissions reduction and Australia’s upcoming Paris climate targets.
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141 Articles

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The study, conducted between August 2024 and May 2025, documented widespread whitening in 124 reefs
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