Climate Change Drove Massive European Marine Heatwaves
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- World Weather Attribution researchers found climate breakdown accounted for about two-thirds of observed excess heat, warming waters by 2C in the Mediterranean, 1.4C in the Bay of Biscay and Iberian Peninsula, and 1.3C around Ireland and the Channel.
- The study determined the hottest fortnights would have been "virtually impossible" without climate change in three of four sea regions examined, while the Celtic region reached heat levels that previously struck only once a century.
- Marine heatwaves covered 90% of the Bay of Biscay and Iberian coast and 80% of the western Mediterranean in 2026, roughly double what would be expected in a preindustrial climate, the analysis found.
- Removing the climate-change effect slashed the expected heatwave area from 70% to 9% in the eastern Mediterranean and from 80% to 30% in the Celtic region, according to the rapid analysis, which has not yet been peer-reviewed.
- Co-author Claire Bergin of Maynooth University warned that the warming "has the potential to completely reshape ecosystems that coastal communities rely on for food and income" and intensify extreme weather on land.
- Separate research published in January found extreme rainfall over coastal land is accompanied by a nearby marine heatwave 5-25% of the time, and downpours linked to strong marine heatwaves deliver 20-30% more rain.
- Mohamed Adow, director of Power Shift Africa, said Europe "cannot acknowledge the science with one hand while continuing to expand fossil fuels with the other," questioning the continent's continued oil and gas expansion.
Why it matters: The study quantifies how much of Europe's 2026 ocean heat extremes are attributable to fossil-fuel-driven warming rather than natural variability, with coverage of 90% in the Bay of Biscay and 80% in the western Mediterranean far exceeding the ~40% baseline of a preindustrial climate. It spotlights a contradiction Mohamed Adow flagged: Europe is the fastest-warming continent yet continues to expand oil and gas infrastructure that locks in further warming.
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