Greenhouse gas levels hit new record highs in 2025: UN
Summary
Greenhouse gas concentrations in the atmosphere reached record highs in 2025, with carbon dioxide, methane and nitrous oxide all rising to unprecedented levels, the UN said. The World Meteorological Organization warned that the buildup will lock in temperature increases and intensify climate impacts for centuries.
Key Points
- Greenhouse gas concentrations hit new record highs in 2025, according to the UN and the World Meteorological Organization.
- Carbon dioxide, methane and nitrous oxide all rose to unprecedented levels, with CO2 reaching 426.8 ppm.
- WMO warned that the increase will drive long-term warming and more extreme weather for decades and centuries.
- The bulletin also flagged growing concern over trace gases such as hydrogen and sulfur hexafluoride in energy systems.
