In brief
An assessment published by Xinhua on Oct. 30 announced that 340 of 892 reef‑building coral species face extinction, and 96% of shallow‑water reefs are critically endangered when future warming is factored in. Co‑author Francoise Cabada‑Blanco warned that near‑annual bleaching events could halt reef recovery, emphasizing urgent emission cuts and local pressure management.
On Oct. 30, a global assessment released by Xinhua confirmed that 340 of 892 reef‑building coral species are threatened with extinction and that 96 % of shallow‑water reef ecosystems are classified as Critically Endangered when projected climate change is included.
The study, published in Nature last month, was authored by marine ecologist Francoise Cabada‑Blanco, co‑chair of the International Union for Conservation of Nature (IUCN) SSC Coral Specialist Group. Cabada‑Blanco told Xinhua that the risks of species loss and entire ecosystem collapse are distinct but interconnected.
The IUCN assessment issued Oct. 22 also found that 122 of 127 shallow‑water reef ecosystems would face critical endangerment under future warming scenarios. The report warned that marine heatwaves could occur so often in the next five decades that reefs may never recover.
Cabada‑Blanco said the growing frequency of bleaching is alarming: “We are now moving towards near‑annual bleaching, which leaves no recovery window at all.” She added that since the study’s data ended in 2020, conditions likely worsened as bleaching events from 2023 to 2025 became more widespread and longer‑lasting.
Despite the bleak projections, the IUCN noted that most reefs still contain living coral and continue to function. However, the study stressed that reef degradation threatens coastal livelihoods, as reefs support about a quarter of all marine fish species and provide food, tourism and coastal protection.
Ecologists urge immediately cutting emissions and addressing local pressures such as overfishing and pollution to prevent irreversible reef collapse, according to the report.
