Overview
- A new World Meteorological Organization assessment finds 2025 was about 1.44°C warmer than the 1850–1900 average, placing it in the global top three.
- The UK Met Office/UEA/NCAS HadCRUT5 dataset estimates a +1.41°C anomaly, while Copernicus reports +1.47°C, reflecting expected methodological differences across analyses.
- Scientists attribute the long-term rise chiefly to human activity, noting El Niño boosted 2023–2024 by roughly 0.1°C and its influence weakened in 2025.
- The last 11 years rank as the warmest on record, extending an exceptional run of elevated global temperatures.
- An ocean-heat study shows roughly 33% of global seas were in their warmest three historical categories and 57% in their warmest five, with pronounced warmth in the tropical and southern Atlantic, the Mediterranean, the North Indian Ocean, and the Southern Ocean.