Australian coral reefs face risk of collapse within 50 years without drastic action, global assessment finds
Every shallow-water coral reef ecosystem in Australia faces an extremely high risk of collapse by 2075, driven largely by projected ocean warming, according to a global assessment.
A global assessment reveals that all 17 shallow-water coral reef ecosystems in Australia face a high risk of collapse by 2075, primarily due to projected ocean warming and increasing marine heat stress. This assessment, conducted by the International Union for Conservation of Nature (IUCN) in collaboration with the University of Melbourne and over 250 researchers worldwide, also finds that 96% of the world's coral reef ecosystems are now classified as critically endangered on the IUCN Red List of Ecosystems.
The study evaluated coral reefs in 127 tropical and subtropical marine regions, including Australia's Great Barrier Reef and other major reef systems.
Climate-driven warming is the most significant threat to coral reefs globally, causing mass bleaching events and widespread mortality. Dr. Mishal Gudka, a University of Melbourne research fellow and scientific lead of the assessment, emphasizes that while coral reefs have shown resilience in the past, the current risk is escalating and must serve as a wake-up call.
The assessment underscores that much of the risk is driven by future climate scenarios that have not yet materialized, providing a critical window for scaling up conservation and climate efforts to prevent catastrophic loss.
Despite their relatively small footprint covering less than 1% of the ocean floor, coral reefs support around a quarter of all marine species, providing habitat, food, and breeding grounds for thousands of species. They also support fisheries, tourism, and coastal protection for millions of people worldwide. Coral reefs are considered collapsed when hard corals largely disappear, replaced by algae and rubble.
Dr. Ben Fitzpatrick, leading the Australian assessment, notes that while local management can help Australian reefs adapt, these gains are being overwhelmed by climate change. He stresses that rapid decarbonization and stronger local conservation measures are needed to avoid the collapse of all coral reefs. Dr. Grethel Aguilar, IUCN Director General, underscores the importance of coral reefs as vital signs of ocean health, emphasizing that their decline threatens biodiversity and communities dependent on marine ecosystems.
The global assessment, coordinated by IUCN and other organizations, highlights the need for decisive action to address climate change and halt further ocean warming.
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