In which year will the monthly mean average CO2-value surpass 400 ppm - at least in one month?
Currently Open, suspends 11/30/2015 19:10 (in )
chart with monthly data: http://www.esrl.noaa.gov/gmd/ccgg/trends/#global
weekly data: ftp://ftp.cmdl.noaa.gov/ccg/co2/trends/co2_weekly_mlo.txt
monthly data: ftp://ftp.cmdl.noaa.gov/ccg/co2/trends/co2_mm_mlo.txt
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