I'd suggested that once as a joke.
Here's a link to a paper that found a negative correlation between CO2 levels and warming.
The concentration of atmospheric CO2 is likely being controlled by the global three dimensional distribution of the different phases (vapor, condensed, and frozen) of water. As such, it is probably a good lagging response to global climate change.
More HERE
A correspondent summarizes Haynie's paper as follows:
Assumption: The earth loses thermal energy by radiating to space, i.e., by outbound long wave radiation (OLR).
Assumption: Components in the atmosphere slow down the rate of energy loss.
Assumption: If a CO2 greenhouse effect is measurable, it should be a statistically significant contributor to the total atmospheric resistance to OLR.
Testing these assumptions against climate scenarios provided by NOAA, the factors of precipitable water, precipitation rate, and sea surface temperature are found to be statistically significant.
On the same basis, and using data from Scripps, CO2's impact comes out as slightly negative, indicating that it accelerates OLR rather than resisting it.
However, since other factors exceed any CO2 signal, it's safer to say that its impact is lost in the noise and as such is simply not measurable.
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