See Svante Arrhenius (1859-1927). Arrhenius suggested a doubling of the CO2 concentration would lead to a 5oC temperature rise. He and Thomas Chamberlin calculated that human activities could warm the earth by adding carbon dioxide to the atmosphere. This research was a by-product of research of whether carbon dioxide would explain the causes of the great Ice Ages.
Ångstrom (not THE Ångstrom, but his scientist son) countered. One of the arguments presented by Ångström was that the main CO2 absorption band is between 14-16 micron and that band is also absorbed by water vapor (which is correct). None of this matters because radiative heat transfer is only 20% of the energy transferred to the atmosphere
Just saw this. Thank you.