Recent data source
CO2: NOAA ESRL CCGG page.
CH4: NOAA ESRL Global Monitoring Division page.
N2O: NOAA ESRL HATS N2O page.
Other Trace Gases: NOAA ESRL HATS Total_Cl_Br, NOAA GMD HATS SF6 pages.
Figure also available in PDF. For 2014, NOAA/ESRL data are used for CO2 and N2O, and linear extrapolations are used for CH4 and other trace gases. (Last modified: 2015/02/07)The original figure is Fig. 2 in Hansen, Fung, Lacis, et al. 1988, "Global Climate Changes as Forecast by Goddard Institute for Space Studies Three-Dimensional Model", JGR 93, 9341-9364.
The curves are 5-year running means with the last two points 3-year running mean and annual mean, Data through 2015 as described above.
Figure also available in PDF. (Last modified: 2016/04/10)