The key point: According to the Geneva-based World Meteorological Organization, greenhouse gas concentrations hit a record in 2025 and are still rising.
The findings
- Gases concerned: carbon dioxide, methane and nitrous oxide.
- Temperatures: the last eleven years are the warmest on record.
- Duration: CO₂ affects the climate for decades, even centuries.
The context
- Timing: bulletin released ahead of COP31, from 9 to 20 November in Antalya.
- Method: it measures accumulated concentrations, not annual emissions.
Key figures
- Share of emitted CO₂ remaining in the atmosphere: about half.
In short
The WMO confirms a continued rise in greenhouse gases ahead of COP31.
