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WMO reports record greenhouse gas concentrations in 2025
The World Meteorological Organization (WMO) has released its 22nd annual Greenhouse Gas Bulletin, revealing that concentrations of carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O) reached unprecedented levels in 2025.
Average global CO2 concentrations rose to 426.8 parts per million (ppm), representing 153% of pre-industrial levels from 1750. Methane concentrations reached 1,948 parts per billion (ppb), or 267% of pre-industrial levels, while nitrous oxide reached 339.1 ppb, or 126% of pre-industrial levels.
While the CO2 growth rate of 2.8 ppm between 2024 and 2025 was slightly lower than the surge seen during the 2023-2024 El Niño period, the overall rate of CO2 concentration growth has tripled since the 1960s. WMO Deputy Secretary-General Ko Barrett warned that these gases are trapping an unprecedented amount of heat, increasing the risk of extreme weather and economic instability. Experts noted that the last 11 years have been the warmest on record and that the long lifetime of CO2 will impact the global climate for decades or even centuries.
Entities
Antalya · Ko Barrett · London Register of Subsurface CO2 Storage · Oksana Tarasova · Petrobras · Samuel Krevor · Santos Basin · Sleipner project · United Nations · World Meteorological Organization
Claims
What the coverage asserts, and how many sources carry each claim.
- [● 11 SOURCES] CO2 levels in 2025 increased by 2.8 ppm compared to 2024. www.vol.at · courage-lounge.de · www.kurierverlag.de · www.leinetal24.de · www.hellwegeranzeiger.de · +6 more
- [● 8 SOURCES] The El Niño phenomenon contributed to the rise in CO2 through vegetation fires. www.vol.at · courage-lounge.de · www.kurierverlag.de · www.leinetal24.de · www.hellwegeranzeiger.de · +3 more
- [● 5 SOURCES] Methane is responsible for 16 percent of the greenhouse effect. www.vol.at · courage-lounge.de · www.suedtirolnews.it · www.portal27.com.br · observador.pt
- [● 6 SOURCES] Carbon dioxide is responsible for 66 percent of the greenhouse effect from gases. www.vol.at · courage-lounge.de · www.suedtirolnews.it · www.cnnbrasil.com.br · www.noticiasaominuto.com.br · +1 more
- [● 17 SOURCES] Atmospheric CO2 concentration reached 426.8 ppm in 2025. www.vol.at · courage-lounge.de · www.kurierverlag.de · www.leinetal24.de · www.hellwegeranzeiger.de · +12 more
- [● 17 SOURCES] CO2 concentrations are 153 percent of pre-industrial levels from 1750. www.vol.at · courage-lounge.de · www.kurierverlag.de · www.leinetal24.de · www.hellwegeranzeiger.de · +12 more
- [● 9 SOURCES] Methane concentrations reached 1,948 ppb in 2025, which is 267% of pre-industrial levels. www.portal27.com.br · odia.ig.com.br · www.europasur.es · offthepress.com · www.diariodejerez.es · +4 more
- [● 10 SOURCES] The growth rate of CO2 concentration in the atmosphere has tripled since the 1960s. www.portal27.com.br · www.cnnbrasil.com.br · www.europasur.es · www.levante-emv.com · www.diariodeibiza.es · +5 more
- [● 24 SOURCES] The average global concentration of CO2 reached 426.8 ppm in 2025. www.portal27.com.br · www.cnnbrasil.com.br · odia.ig.com.br · www.vol.at · courage-lounge.de · +19 more
- [● 20 SOURCES] The annual increase of CO2 between 2024 and 2025 was 2.8 ppm. www.portal27.com.br · www.cnnbrasil.com.br · www.vol.at · courage-lounge.de · www.kurierverlag.de · +15 more
- [● 8 SOURCES] Nitrous oxide concentrations reached 339.1 ppb in 2025, which is 126% of pre-industrial levels. odia.ig.com.br · www.europasur.es · offthepress.com · www.ultimahora.com · zielona.interia.pl · +3 more
- [● 3 SOURCES] The 22nd Annual Greenhouse Gas Bulletin was released on October 27, 2026. www.portal27.com.br · www.cnnbrasil.com.br · odia.ig.com.br