Global coral reef coverage declines by 9.5% amid rising ocean temperatures

A new global assessment by the Global Coral Reef Monitoring Network (GCRMN) reveals that worldwide coral reef coverage has declined by approximately 9.5% compared to the 1980-2009 baseline. The report, titled ‘State of the World’s Coral Reefs: 2025’, identifies marine heatwaves and mass bleaching events as the primary drivers of this loss. Climate change is increasing the frequency and intensity of these heatwaves, leaving ecosystems with insufficient time to recover between impacts.

In response to such degradation, localized restoration efforts are providing critical support. In Florida, the Coral Restoration Foundation utilizes a network of nearly 1,000 ‘Coral Trees’—underwater nursery structures—to cultivate coral fragments. These nurseries allow species like staghorn and elkhorn coral to grow in protected environments before being reintroduced to reefs. The foundation manages several nurseries capable of producing over 50,000 corals annually, acting as a biological insurance policy against natural disasters.

Experts emphasize that while local interventions and scientific monitoring are vital for recovery, long-term reef survival depends on the rapid reduction of global greenhouse gas emissions to mitigate rising ocean temperatures.