World’s Oceans Absorb Record Heat Equal to Nearly 40 Times Annual Global Energy Use
The world’s oceans absorbed a record 23 zettajoules of heat in 2025 an amount nearly 40 times greater than the total energy used by humanity during the year according to the latest Copernicus Ocean State Report.
The report highlights continuing changes in the oceans, including rising sea levels, increasing acidity and growing stress on marine ecosystems.
Oceans absorb most excess heat
The oceans have absorbed around 90% of the additional heat trapped in the Earth’s climate system by greenhouse gas emissions. They have also taken up about one third of the carbon dioxide released by human activities.
According to the report, global sea levels have risen by an average of about 3.8 millimetres per year since 1999. The rate increased to approximately 4.2 millimetres per ye...









