Overview
- The World Weather Attribution report, released Aug. 18–19, concluded that human‑caused warming was the primary driver of this summer's record sea temperatures around Europe and quantified the human contribution to those extremes.
- The study found climate change added about 2°C of warming to the Mediterranean and roughly 1.3–1.4°C to Western European seas, with the Mediterranean July average just over 27°C and an offshore buoy near Mallorca reaching about 33°C.
- Large marine‑heatwave extents were documented this summer, with roughly 80% of the Western Mediterranean and 90% of the Bay of Biscay/Iberian region affected compared with about 40% that would have been expected without human warming.
- Researchers combined observations with climate‑model counterfactuals to compare the real world with a simulated world without human emissions, and independent Copernicus monitoring reported record global ocean temperatures in July that support the finding.
- Scientists warned of immediate human impacts: species shifting north, habitat‑forming organisms facing mass mortality, damage to fisheries and aquaculture, higher coastal humidity that worsens heat stress, and a greater chance of stronger coastal storms if emissions continue unchecked.