The fourth mass bleaching event since 1998, which impacted 84% of the world’s coral reefs between 2023 and 2025, seemed to confirm the worst predictions.
The National Oceanic and Atmospheric Administration (NOAA) Coral Reef Watch program was even forced to add new alert levels to its scale to reflect the rising risk of mass coral die-offs.
However, research presented Tuesday in Kenya introduces new evidence that changes the picture: there are far more reefs capable of withstanding heat than previously believed.
The Study Tripling the Number of Resilient Reefs
The Wildlife Conservation Society (WCS) and Australia’s Macquarie University assessed coral reefs around the world and concluded that 64,093 square miles — approximately one-third of the world’s total — are “climate-resilient.”
In other words, they can survive major ocean warming events.
The analysis, known as the 50 Reefs+ study, combines more than 45,000 field observations of corals collected between 1960 and 2025 with climate, oceanographic, and human-impact data.
The result is the most detailed global map ever produced of reefs capable of withstanding or recovering from thermal stress and other extreme events, such as cyclones.
The new map is 10,000 times more detailed than any previous version. This level of detail allowed researchers to identify three times as many resilient reefs as had been found in prior assessments.
The map was developed with support from SkyTruth, a nonprofit technology organization that uses satellite imagery and artificial intelligence to track environmental threats.
Where They Are and What Makes Them Different
Sixty-one percent of the identified resilient reefs are concentrated in five countries: The Bahamas, Cuba, Australia, Indonesia, and the Philippines.
The study also identified resilient reef zones in Belize, Panama, and the Turks and Caicos Islands that had not been included in earlier analyses.
These reefs share specific oceanographic characteristics — cooler currents, less solar exposure, and lower sensitivity to weather fluctuations — all of which shield them from the thermal stress that destroys live coral tissue.
In some of these areas, recovery after a bleaching event has been remarkable.
In one case documented by the WCS, coral cover in an area dropped from 44% to 27% following the 2024 bleaching but rebounded to 40% just one year later.
This study updates and expands on the original 2018 work that identified 50 reefs with the highest chances of survival. The new version adds 30 countries and 54 additional territories and jurisdictions to the analysis.
The Challenge: Only 28% of Those Reefs Are Protected
But the encouraging news comes with an immediate caveat.
Only 28% of the climate-resilient reefs identified in the study are located within protected or conserved areas.
That amounts to roughly 46,332 square miles of ecosystems with no formal safeguards against direct threats such as water pollution, destructive fishing, and poorly managed coastal development.
The authors of the study have launched a public campaign called Our Reefs, Our Future, urging governments to prioritize protecting these reefs from direct local threats.
The underlying argument is that while climate change cannot be stopped at the scale of a single reef, local stressors — such as sediment, sewage, and overfishing — can be reduced through targeted policies.
The study was presented at the Our Ocean Conference, held from June 16 to 18 in Mombasa, Kenya. This global forum brings together governments, scientists, and conservation organizations to make commitments on ocean protection.
At the conference, Kenya signed the first high-level pledge to protect climate-resilient coral reefs, joining more than a dozen governments that had already made similar commitments.
A Dispute With the IPCC Over the Future of Corals
The findings have stirred some debate among scientists.
The study directly challenges the projections of the Intergovernmental Panel on Climate Change (IPCC), the United Nations’ leading scientific body on climate change. The IPCC has estimated that 70% to 90% of coral reefs could disappear with global warming of 2.7 degrees Fahrenheit above preindustrial levels, and up to 99% if warming reaches 3.6 degrees Fahrenheit.
The authors of the study don’t dispute those overall figures — they’re simply adding geographic nuance.
Resilience is not uniformly distributed, and the research aims to pinpoint which areas are most resilient, so that conservation resources can be directed where they matter most.
Meanwhile, another international team of 28 scientists published a call to action in Nature Reviews Biodiversity in March 2026, urging accelerated research into assisted coral evolution. This includes techniques to increase the thermal tolerance of colonies and reduce their mortality during marine heatwaves.
The idea is that the natural resilience identified in the new map could be complemented by scientific interventions aimed at helping the most vulnerable species adapt more rapidly.
According to lead researcher Kyle Zawada of Macquarie University, resilient reefs could serve as living seed banks, helping to restore more heavily degraded ecosystems.
Ultimately, the new map is not a guarantee of survival, but a tool for deciding where to act first.
