Nearly every indicator of climate change is flashing red. But we still hold the tools available to bring the planet back into balance
The ocean is running a fever. In 2025, the number of days of marine heatwaves – prolonged spells when the sea turns abnormally, dangerously warm – was more than triple what it was in the early 1990s.
These are not abstract statistics. A severe and persistent marine heatwave bleaches coral reefs, strips away the kelp forests that shelter young fish, empties fishing grounds and – if occurring frequently – can tip whole ecosystems past the point of recovery.
Karina Von Schuckmann is an IGCC author and senior adviser of Mercator Ocean International

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