I have submitted the following comment to the Roy Spencer site:
Roy Spencer wrote: "...we have only one subject to study, the Earth. Establishing causation in such a situation is dicey, at best."
Wrong. We have Earth AND Venus, which are easily shown to be warmed alike, despite the great differences in albedo (30% vs. 70%), CO2 atmospheric concentration (.04% vs. 96.5%), and planetary surface (Earth is 70% ocean, Venus all solid crust), because: The ratio of atmospheric temperatures, Venus/Earth, is essentially a constant over the range of Earth tropospheric pressures, and especially so away from the Venus cloud layer, where the constant (1.176) is PRECISELY due to the ratio of the two planets' distances from the Sun. This fact can only be explained by concluding that both atmospheres are warmed by absorption of the SAME fraction of the incident solar irradiation, and not from the planetary surface: I have explicitly given (at the above link) the simple equations for the mean temperatures in the two atmospheres based upon that assumption, and shown that the fraction (f) absorbed by the two atmospheres drops out of the equation for the ratio of the temperatures, so that one can apply the basic Stefan-Boltzmann formula, without any albedo correction, as I did boldly and simply in my original approach. With the temperature ratio due only to solar distances, there is simply no greenhouse effect due to the much larger CO2 in Venus's atmosphere. That is how easy it is to establish (the lack of) causation, of a supposed temperature increase with increasing carbon dioxide (and thus for any "greenhouse gas"). See also "For Climate, All the World's a Stage".
There have been no competent climate scientists since the Venus temperature and pressure data was obtained over 20 years ago, an elementary study of which (like mine) should have quickly killed the "global warming greenhouse effect". The only real atmospheric warming by IR-absorbing gases is the fundamental warming by direct absorption of incident solar radiation. There is no extra warming due to increasing CO2--nor is there extra warming from the surface (surface warmth merely drives the weather/climate).
This is the revolutionary correction to climate science that everyone is steadfastly ignoring. Everyone needs to admit, first to themselves and then immediately to the world, their mistakes, but right now, everyone but me continues to double down on their invalid scientific prejudices. I understand that, but it makes all the debates since my Venus/Earth analysis simply irrational avoidance behavior, entirely unworthy of true, dispassionate science.