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.

This level of warming will increase climate risks, especially for vulnerable societies. Although the average temperature over the next five years is likely to exceed 1.5°C above pre-industrial levels ...

Scientists predict that 2026 will be one of the hottest years since 1850, as heat-trapping emissions continue to boil the planet. Earlier this month, data from Copernicus warned that 2025 is currently ...