According to the latest report of WMO GAW, the global average surface mole fraction of CO2, CH4 and N2O in 2017 were 405.5 ± 0.1 ppm, 1859 ± 2 ppb and 329.9 ± 0.1 ppb, respectively, which were 146%, 257% and 122% of the pre industrial level (before 1750), respectively<br>
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