世界气象组织：2023年世界气象组织温室气体公报（英文版）

The latest analysis of observations from the WMO GAW in situ observational network shows that globally averaged surface mole fractions(4) for carbon dioxide (CO2), methane (CH4) and nitrous oxide (N2O) reached new highs in 2021, with CO2 at 415.7±0.2 ppm,(5) CH4 at 1908±2 ppb and N2O at 334.5±0.1 ppb. These values constitute, respectively, 149%, 262% and 124% of pre-industrial (before 1750) levels. The increase in CO2 from 2020 to 2021 was equal to that observed from 2019 to 2020 and larger t