Overview
- Provisional data released ahead of COP30 in Belém show the decade-long streak of exceptional global heat extending into 2025.
- Atmospheric greenhouse gas concentrations rose by a record 2.3%, with the largest share of the increase attributed to India, followed by China, Russia and Indonesia.
- Measured temperatures through the end of August 2025 were about 1.42°C above the preindustrial average.
- WMO chief Celeste Saulo says science indicates temperatures could be brought back toward roughly 1.5°C by century’s end with rapid mitigation.
- The WMO reports progress on early-warning systems, rising from 56 countries in 2015 to 119 today, and calls for closing remaining coverage gaps.