So let's start with some simple questions to gauge your 'skepticism', DRYBURGH6.

Q1: Are CO2, CH4, N2O, O3, SF6, CFCs and HFCs greenhouse gases? (Which is to say, do they lack absorption bands in the visible and near-infrared spectral region and do they have absorption bands in the mid-infrared?)
Q2: Have human activities in the past 200 years (and in particular in the past 60) raised the atmospheric concentrations of the gases in Q1?