for all the talk of "sequestering" CO2 how can we ignore the "de-sequestration" of water from underground aquifers? Here's the bottom line-- the high-end estimate of annual CO2 discharge is 25 billion tons per year. However, the annual rate of groundwater "de-sequestration" i.e. the net amout of water pumped to the surface and not returned underground is 160 billion tons per year. Even though all of this water is now in the atmopheric system, i.e. the lower troposphere, let us just assume that half, or 80 billion tons a year ends up as extra atmospheric water vapor. since water vapor has about ten times the "greenhouse effect" as CO2, this is the CO2 equvalent of 800 Billion tons!! Or about 32 times the impact of CO2 increase!! Water aquifer info is from various sources, including USGS and USAID.

water vapor does not condense normally into rain when polluted so there is more water vapor in the atmosphere because it has been made toxic and gaseous

There is a very strict, and pretty low partial pressure limit to water in the atmosphere, as well as to limits on suspension of ice/water particles in the air. This is true even for slight rises of temperature. Suffice it to say that any amount of water removed from the ground goes into the ocean or possibly into ice.  The main effect is localized freshening of sea water.  The atmosphere really does not count as a storage in the water cycle.

Water vapor is essentially an system amplifier of heat forcing, where as C02 makes the forcing term larger.

I'm trying to think of a good mechanical analogy.