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World’s seas heated by a record 23 zettajoules last year

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World’s seas heated by a record 23 zettajoules last year

The Guardian · Sep 30, 2026, 6:00 AM UTC

The injection of thermal energy, 40 times that used by humanity in total, comes amid an increasing rise in sea levels and continuing acidification A record-breaking 23 zettajoules of heat was sunk into the world’s seas last year, leaving ocean waters hotter, higher and less hospitable, a report has found.…