  Recently, Smirnov published a paper (B. M. Smirnov, "Collision and radiative
processes in emission of atmospheric carbon dioxide", 2018, J. Phys. D.: Appl.
Phys., Vol. 51, No. 21, pp. 214004) which dismisses the role of increasing
concentrations of anthropogenic CO$_2$ on global warming of planet Earth. We
show that these conclusions are the consequence of two flaws in Smirnov's
theoretical model which neglect the effects of the increased concentrations of
CO$_2$ on the absorption of Earth's blackbody radiation in the 12-15$\mu$m
region. The influence of doubling the concentration of CO$_2$ in the atmosphere
on the surface temperature is not $\Delta$T=0.02K, or even $\Delta$T=0.4K if
only one of the two mistakes in Smirnov's analysis is corrected. The correct
value lies within $\Delta$T=1.1-1.3K as outlined by other authors analysis
using simplified, yet more theoretically consistent models.
