Overview
- Global agencies report 2023–2025 as the hottest three-year span on record, with 2025 ranking among the three warmest years despite La Niña conditions.
- World Weather Attribution identified 157 high-impact extremes in 2025, analyzed 22 in depth, and found at least 17 were made more likely or severe by anthropogenic climate change.
- Heatwaves were the leading climate-linked killer in 2025, and roughly 4 billion people experienced at least one additional month of extreme-heat days attributable to warming.
- Some extremes are now up to ten times more probable than a decade ago, while event analyses found Hurricane Melissa’s odds boosted up to 700 times with stronger peak winds and higher damage potential.
- Researchers warn that escalating hazards are testing adaptation limits and disproportionately harming vulnerable regions, calling for faster fossil-fuel phaseout, stronger early warning systems, and improved data in the Global South.