I agree that water vapor is the bigger culprit in respect to global warming.
It's that damn evaporation problem. We need to get anti-evaporation covers over the oceans to do something about that.
Maybe we also need to get some giant sunglasses up there, to cut down on the amount of solar radiation reaching the Earth.
Seriously, I don't personally know what the share splitting is between water vapor and carbon dioxide. I do think that human influences have little to nothing to do with water vapor levels. That is, other than the feedback loop, that increased temperatures cause increases in atmospheric water vapor content.
Moose
Professor, geology, Whatsamatta U
Evolution - Changes in the environment, caused by the interactions of the components of the environment.
"Do not meddle in the affairs of cats, for they are subtle and will piss on your computer." - Bruce Graham
"The modern conservative is engaged in one of man's oldest exercises in moral philosophy; that is, the search for a superior moral justification for selfishness." - John Kenneth Galbraith
"I know a little about a lot of things, and a lot about a few things, but I'm highly ignorant about everything." - Moose