This posting just points to a very well done page that calculates the relative contributions to the greenhouse effect as used by the AGW thesis, by various gasses. In particular, it includes water vapor. The result is a conclusion that human caused CO2 is not relevant to global temperature. Something I have said before, but without the nice graphs and calculations.
It really is all about the water on our water world.
Water Vapor Rules the Greenhouse System
Just how much of the “Greenhouse Effect” is caused by human activity?
It is about 0.28%, if water vapor is taken into account– about 5.53%, if not.
This point is so crucial to the debate over global warming that how water vapor is or isn’t factored into an analysis of Earth’s greenhouse gases makes the difference between describing a significant human contribution to the greenhouse effect, or a negligible one.