Great Barrier Reef Suffers Record Coral Decline Due to Marine Heatwave

Record Coral Decline

• 📉 The Great Barrier Reef has experienced its largest decline in coral cover in two of its three regions over the last year, according to the Australian Institute of Marine Science.
• 🌡️ This sharp decline is attributed to a mass coral bleaching event driven by a global marine heatwave.

Extent of Bleaching and Loss

• 🌊 In the northern Great Barrier Reef, coral cover dropped by approximately a quarter between 2024 and 2025.
• 💔 The southern reef lost nearly one-third of its high coral cover, marking the largest decline ever recorded in these regions over 39 years of monitoring.
• 🌍 The 2024 bleaching event had the largest footprint ever recorded, with high to extreme bleaching across all three regions of the reef.

Economic and Environmental Impact

• 🐠 The Great Barrier Reef, the world's largest living ecosystem, contributes 4.2 billion annually to Australia's economy.
• ⚠️ Ecologists warn of significant biodiversity loss if bleaching events continue.

Conservation and Climate Change

• UNESCO has recommended the reef be added to the list of world heritage sites in danger, but Australia's government has lobbied against this to protect tourism.
• 🏭 Climate change is identified as the biggest threat to coral reefs globally, and cutting greenhouse gas emissions is crucial for their future survival.