And many, such as methane, are far more powerful greenhouse gases in terms of infrared absorption per molecule. (newscientist.com)
Although somewhat of a simplification, since it's strongest infrared absorption bands are already saturated, the greenhouse effect of additional carbon dioxide in the atmosphere is approximately logarithmic. (judithcurry.com)
For example, in the troposphere, the net infrared absorption - emission is a cooling effect, which balances convective heating. (realclimate.org)