Indeed so. If you look at the absorption charts in the infrared (heat) portion of the spectrum, H2O absorption is the greatest (many resonance lines there). CO2, by comparison, only has a few. Oh, and present day CO2 concentrations are only a slight percentage above the lowest they have been for billions of years. No lie, look it up. So yup, we are deniers. Silly science deniers, that is.
Not exactly. Carbon levels are about 50 percent higher than recent norms.... considerably above the norm for the last several million years. But they certainly have been higher in the past, and those high times don’t correlate well with heat, and heat certainly doesn’t correlate well with less life.