antagon;
edit: H2O is molecule for molecule more effective than CO2 across the spectrum, at least.
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That is correct. However, the residence time of H2O in the atmosphere is less than ten days. That of CO2 about two centuries. So the little valve turns on the big valve.
CO2's residence time is NOT 200 years! It is between 5 and 15 years.
CO2 Science
that is one of those things that make you go 'hmmmmmmm'
was a much, much longer atmospheric lifespan for CO2 necessary for the alarmists or just convenient? the 5-15 years is the half life isnt it, and I don't really know what residence time is.