_:genid1 "Free to use with credit to the original figure source."^^ . "climate-forcing-by-greenhouse-gases" . "Climate Forcing by Greenhouse Gases"^^ . "Radiative climate forcing by long-lived greenhouse gases. Direct radiative forcing (in Wm-2) by four classes of major long-lived greenhouse gases (left panel), and percentage of the total direct forcing for each of the four (right panel). Annual averages are from NOAA’s Global Cooperative Air Sampling Network. Credit: NOAA Climate Monitoring and Diagnostics Laboratory."^^ . _:genid1 . . .