Bill McKibben is now terrified of Methane.

Global Warming’s Terrifying New Chemistry | The Nation
Methane was 2 PPM in 1984, and it is 2 PPM now. 
ftp://aftp.cmdl.noaa.gov/products/trends/ch4/ch4_annmean_gl.txt
Radiative transfer models show that Methane has almost no impact on downwelling longwave radiation, This is because it is very low concentration, and because it overlaps with the absorption/emission spectra of H2O.



























