Coral Reefs Face a Growing Extinction Crisis

About 49% of all the world’s reef-forming corals face an increased risk of extinction, new research in Nature reports. Researchers say that accelerating warming of the seas due to climate change poses the greatest threat to the world’s coral and that its loss could put marine biodiversity, food security, coastal protection, and livelihoods of millions of people at risk.
Referred to as “rainforests of the sea,” coral reefs support an incredible number of marine species in a tiny sliver of ocean. When waters are warm for an extended time, corals will shed the Algae in their bodies in a natural mechanism known as bleaching. Bleached corals are alive for now, but heat stress over and over again or too intensely can leave them stressed and vulnerable to other threats.
The impacts ripple well beyond the reef. Reefs provide natural storm barriers, dissipate wave energy, and create calmer waters that protect coastal homes and livelihoods. They also support fisheries and tourism sectors, which is a critical livelihood source for many households, especially in the tropical areas.
Scientists have warned that cutting greenhouse-gas emissions is the best hope for the long term, since no amount of local conservation can protect corals from the onslaught of more frequent marine heat waves. Other actions, such as banning destructive fishing, reducing coastal pollution, replanting degraded reefs and creating more marine reserves can help coral populations survive.

The analysis gives added weight to international climate negotiations:

unless emissions are drastically reduced soon, the entire planet stands to do away with not just amazing ecosystems, but the underlying natural infrastructure and food systems on which huge numbers of people depend.

References:
Nature: “Climate change: Nearly half of reef-building coral species at higher relative risk of extinction” October 16, 2026.
International Union for Conservation of Nature (IUCN): “Nearly half of reef-building coral species face elevated relative risk of extinction” October 2026.
Associated Press (AP): “Scientists say nearly half of reef-building corals face elevated risk of extinction due to climate change” October 16, 2026.
University of Portsmouth: “Nearly half of reef-building coral species face higher risk of extinction” October 14, 2026.
The Nature Conservancy: “What Is the Future of Coral Reefs?” May 8, 2026.