environment
Report finds record heat accumulation in the world’s seas
23zettajoules
The world’s seas absorbed 23 zettajoules of heat in 2025.
The 10th Copernicus ocean state report found that the world’s seas absorbed a record 23 zettajoules of heat in 2025. It also documented faster sea-level rise, increasing acidity, marine heatwaves and damage to marine ecosystems.
1 sourceThe GuardianUpdated
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- 23zettajoules
The world’s seas absorbed 23 zettajoules of heat in 2025.
“A record-breaking 23 zettajoules of heat was sunk into the world’s seas last year”
- 40times
The heat added to the seas was almost 40 times the energy humanity used in 2025.
“almost 40 times greater than all the energy humanity used that year”
- 3.8mm per year
Average sea-level rise has been about 3.8mm per year since 1999.
“Sea levels have risen by about 3.8mm per year since 1999”