The year 2025 was the warmest on record for the heat content of the world’s oceans. Ocean heat content (OHC) increased by around 500 zettajoules – billion trillion joules – since the 1940s.
2025 is on track to become the second–hottest year on record, scientists say – second only to 2024. The experts at Copernicus Climate Change Service (C3S) say the average temperature in the first 11 ...
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