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Actually, there might be some truth in that, but not in the way you mean.
One of the feedbacks counted on by the IPCC to create the dire warming that they predict is the increase in Water Vapor as a feed back from the warming caused by the increase in CO2.
There are two basic problems with this as evidenced by the FACT that the warming they have predicted has not occurred:
1. The Water vapor increase would produce more clouds and those clouds would reduce warming in two ways: At high altitude, the solar radiation would be reflected back to space. At lower altitudes, the shadows cast on the ground would reduce the Albedo heating and that would also produce a lack of warming. Of course rain is a cooling agent when it evaporates after having fallen or when it evaporates at any altitude.
2. The Green House properties of the incremental increases in CO2 decrease logarithmically. At the current concentrations, it will require a tripling of the CO2 to about 1200 ppm in the air before another degree of heating occurs due to CO2 Green house heating.
4. Carbon dioxide is already absorbing almost all it can « JoNova
You're ruining my fun...