Guardian: World’s oceans absorbed record heat equal to 40 times annual global energy use

All the energy used by the earth’s entire population in one year all adds up to about half of a zettajoule.

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.

The explosive addition of thermal energy, which was almost 40 times greater than all the energy humanity used that year, comes amid far-reaching changes to the deep water bodies fundamental to life on Earth.

Sea levels have risen by about 3.8mm per year since 1999, and at a faster rate of 4.2mm per year between 2012 and 2025, according to the 10th edition of the Copernicus ocean state report. It found the global ocean has become 17% more acidic in the last 40 years.

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The scientists found a clear acceleration of sea level rise in the western Mediterranean, even as the eastern part showed uneven gains. The entire sea has warmed by 0.32C per decade, the report found, driving up marine heatwaves, particularly in the last few years.

The report comes as western Europe experiences an unusually warm September right after its ruinously fiery summer, with temperatures hitting 40C highs in parts of Spain and Portugal last week. Hot coastal waters exacerbate heatwaves on land by adding heat during nights that would otherwise cool down.

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