Keywords: Chart of CO2 concentration in atmosphere 1960-2012.png en CO2 concentrations measured at Mauna Loa by NOAA 2012-07-18 http //www esrl noaa gov/gmd/ccgg/trends/ Earth Science Research Laboratory NOAA PD-USGov Uploaded with UploadWizard CO2 Uncategorized 2014 June 7 |