Global ocean temperatures have broken records for the third year in a row, according to data from NOAA and the European Copernicus Climate Change Service. The sustained warming is driving coral bleaching events, disrupting fisheries, and fueling more intense hurricanes.
Average sea surface temperatures in July 2026 were 0.4°C above the previous record, a gap that climate scientists describe as extraordinary.
Marine Ecosystem Collapse
The Great Barrier Reef has experienced its worst bleaching event on record, with surveys indicating that more than 80 percent of reef areas show signs of heat stress. Similar events are occurring across the Caribbean and Indian Ocean.
Feedback Loops
Warmer oceans absorb less carbon dioxide, meaning that continued ocean heating could accelerate the pace of atmospheric warming in a dangerous feedback loop.
