Key Climate Indicators
| Indicator | Value | Source |
|---|---|---|
| Global mean temperature (2024) | 1.55 ± 0.13°C above 1850–1900 | WMO |
| CO₂ concentration | 427+ ppm | NOAA GML |
| Warmest year in record | 2024 (175-year record) | WMO |
| Sea-level rise rate | 5.9 mm/year (2024) | WMO |
| Ocean heat absorbed (2025) | 23 zettajoules | IAP/CAS |
What 1.5°C Means
Crossing the 1.5°C threshold signals a world of more frequent and intense heatwaves, accelerated ice-sheet melt, disrupted weather patterns, and threatened food security for billions. Sea-level rise and ocean warming set in motion today are irreversible for hundreds of years, locking in consequences that will outlast every institution currently governing our response.
Sources
- WMO State of the Global Climate 2024
- NASA GISS Surface Temperature Analysis
- NOAA Global Monitoring Laboratory