Overview
- The WMO State of the Climate report, released Monday for World Meteorological Day, finds a record positive energy imbalance in 2025, meaning more energy entered Earth’s system than escaped to space.
- More than 91% of the excess heat is now stored in the ocean, and global ocean heat content reached a new high in 2025.
- The period 2015–2025 was the hottest decade on record, with 2025 ranking second or third warmest and 2024 still the hottest year at about 1.55°C above the 1850–1900 average.
- Greenhouse gases hit multi‑millennial highs, with carbon dioxide at levels not seen in roughly 2 million years and methane and nitrous oxide at their highest in about 800,000 years.
- The report links the trend to rising human costs, citing deadlier heat, floods, fires and storms in 2025, and warns that sea level will keep rising for centuries as oceans warm and land ice shrinks.