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These debates always seem to center around CO2. But, CO2 is just not a very good greenhouse gas.

A much better greenhouse gas is water vapor. Methane is also up there, each at well over 10 X the warming effectiveness of CO2.

Oh, and good old chlorofluorocarbon, (Freon) is way up there, with well over a thousand times the effectiveness of CO2 for warming.

Even solar variability has more impact than CO2.

Oh, and SO2 is also more powerful than CO2, especially when water vapor is present.

It's really a quite complex subject.