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The International Union for Conservation of Nature (IUCN) has delivered a stark warning about the future of the world’s coral reefs. In the first comprehensive global assessment of its kind, the organisation classified 96 percent of shallow-water coral reef systems as critically endangered—the highest risk category—projecting that nearly all could collapse by 2075 if current trends continue.
According to the IUCN, heat stress from climate change represents the single most consistent threat driving coral reef decline worldwide. Corals are particularly sensitive to temperature fluctuations, and the warming of the world’s oceans has increased both the frequency and intensity of damaging bleaching events. The assessment used climate projections from the United Nations that anticipate global temperatures rising 2.7 degrees Celsius above pre-industrial levels by 2100.
Beyond climate change, multiple human pressures compound the crisis. Overfishing threatens 63 percent of coral reef ecosystems, as the removal of herbivorous fish like parrotfish and predatory groupers disrupts the ecological balance that controls algae growth. Coastal development, pollution, tourism, and increasingly severe storms add further stress to these fragile systems.
The IUCN’s analysis examined 127 tropical and subtropical coral systems spanning over 188,000 square kilometres. Some of the world’s most iconic and biodiverse reefs—including Australia’s Great Barrier Reef, the Coral Triangle in southeast Asia, the Caribbean’s Mesoamerican Barrier Reef System, and the Red Sea coral reefs—are among those classified as critically endangered.
Yet the assessment carries a message of cautious hope. Mishal Gudka, scientific lead of the IUCN Red List of Coral Reef Ecosystems assessment, emphasised that coral reefs have demonstrated a remarkable capacity to recover from devastating bleaching events. The IUCN stressed that corals in most parts of the world "are not yet lost," and that recovery remains possible with urgent action. IUCN Director General Grethel Aguilar called for ambitious emissions reductions, stronger marine protection and restoration efforts, and sustained investment in resilient coastal ecosystems and the communities that depend on them.
The IUCN assessment was released during the UN’s COP17 biodiversity summit in Yerevan, Armenia, where governments are negotiating progress on a landmark pact to halt and reverse biodiversity loss by 2030. A separate study published in the journal Nature found that by 2020, nearly half of coral species were at elevated relative risk of extinction, with climate change identified as the primary driver of decline.
The Caribbean’s Mesoamerican Barrier Reef System is among the world’s most biodiverse coral ecosystems and is classified as critically endangered by this assessment. Caribbean nations and island communities depend heavily on coral reefs for fisheries, coastal protection, and tourism revenue, making this warning directly relevant to the region’s economic and environmental future.
Sources and attribution
- Jamaica Observer
- Nearly all coral reefs risk collapse in 50 years: IUCN
- Almost All Coral Reef Ecosystems Face Risk of Collapse in …
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