By the way, CO2 is plant food, full stop!
This paper presents observed atmospheric thermal and humidity structures and global scale simulations of the infrared absorption properties of the earth’s atmosphere.
These data show that the global average clear sky greenhouse effect has remained unchanged with time. A theoretically predicted infrared optical thickness is fully consistent with, and supports the observed value.
It also facilitates the theoretical determination of the planetary radiative equilibrium cloud cover, cloud altitude and Bond albedo. In steady state, the planetary surface (as seen from space) shows no greenhouse effect: the all-sky surface upward radiation is equal to the available solar radiation.
The all-sky climatological greenhouse effect (the difference of the all-sky surface upward flux and absorbed solar flux) at this surface is equal to the reflected solar radiation. The planetary radiative balance is maintained by the equilibrium cloud cover which is equal to the theoretical equilibrium clear sky transfer function. The Wien temperature of the all-sky emission spectrum is locked closely to the thermodynamic triple point of the water assuring the maximum radiative entropy.
The stability and natural fluctuations of the global average surface temperature of the heterogeneous system are ultimately determined by the phase changes of water. Many authors have proposed a greenhouse effect due to anthropogenic carbon dioxide emissions.
The present analysis shows that such an effect is impossible.