A new paper by Chilingar, Khilyuk and Sorokhtin is up to their previous standard.

Here’s the abstract:

The writers investigated the effect of CO2 emission on the temperature of atmosphere. Computations based on the adiabatic theory of greenhouse effect show that increasing CO2 concentration in the atmosphere results in cooling rather than warming of the Earth’s atmosphere.

Wow! How did they come up with that? Here’s their calculation:

To evaluate the effect of anthropogenic emission of carbon dioxide on

global temperature,

one can use the adiabatic model together with the sensitivity analysis

(Sorokhtin,

2001; Khilyuk and Chilingar, 2003, 2004). At sea level, if the

pressure is measured in

atmospheres, then p = 1 atm andΔT ≈ TαΔP (12)

If, for example, the concentration of carbon dioxide in the atmosphere

increases two times

(from 0.035% to 0.07%), which is expected by the year of 2100, then

the atmospheric

pressure will increase by Δp ≈ 1.48×10^{-4}atm (Sorokhtin,

2001). After substitution

of T = 288 K, α = 0.1905, and Δp = 1.48×10^^{-4}atm into Eq.

(13), one obtains

ΔT ≈ 8.12×10^^{-3}°ree; C. ΔT will be slightly higher at

the higher altitudes (Khilyuk

and Chilingar, 2003). Thus, the increase in the surface temperature at

sea level caused

by doubling of the present-day CO2 concentration in the atmosphere

will be less than

0.01°C, which is negligible in comparison with natural

temporal fluctuations of global

temperature.

Where is the greenhouse effect in their equation 12? Well, it’s included in the coefficient α, which **they assume will not change** if CO2 is added to the atmosphere. That is, they assume that CO2 is not a greenhouse gas. And yes, if the laws of physics were different and CO2 was not a greenhouse gas, adding it to the atmosphere would have a negligible effect on temperatures. Duh.

In fact, their model can’t tell us how much warming to expect if CO2 is increased, since to estimate α they use the observed warming from the natural greenhouse effect. To get the new value of α you would get with increased CO2, you would have to know how much this warms the planet.