世界气象组织：2019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 Programme shows that globally averaged surface mole fractions(1) calculated from this in-situ network for carbon dioxide (CO2), methane (CH4) and nitrous oxide (N2O) reached new highs in 2018, with CO2 at 407.8±0.1 ppm(2), CH4 at 1869±2 ppb(3) and N2O at 331.1±0.1 ppb. These values represent, respectively, 147%, 259% and 123% of pre-industrial (before 1750) levels. The increase in CO2 from 2017 to 2018 was very close to that observed from 2