Zet

The world's oceans absorbed roughly 23 zettajoules of additional heat last year, setting a new record for the ninth consecutive year, according to a new report. Researchers compare the figure to the energy of about 12 Hiroshima bombs detonating every second for a year, underscoring how much excess heat from global warming is being stored in the sea.

A new report finds the world's seas took in a record-breaking 23 zettajoules of heat in 2025, leaving ocean waters hotter, higher and less hospitable to marine life. Scientists say the figures underline the accelerating pace of ocean warming driven by climate change, with rising sea levels and stressed ecosystems among the consequences being highlighted.

The world's oceans absorbed a record 23 zettajoules of heat last year, the highest annual figure ever measured, according to reporting by The Guardian. The finding underlines the scale of global warming, since the seas take up the vast majority of excess heat trapped by greenhouse gases. Scientists say rising ocean temperatures drive sea level rise, coral bleaching and more extreme weather.

The world's oceans absorbed a record 23 zettajoules of heat over the past year, according to findings reported by the Guardian. The figure marks a new high for ocean heat content, a key indicator of climate change, and is drawing attention among scientists and environment commentators concerned about warming seas, sea level rise and marine ecosystems.