I don't really see how this is possible for humanity at a scale that affects global warming. Most water vapour by far is generated by nature itself. We couldn't make a dent in that.
The CO2 is what upset the balance and we are by far the biggest contributor there so it makes sense to address that.
The point is reversing the CO2 does not reverse all that proportionally much larger increase in water vapor... eg. we have no choice but to address water vapor as well as CO2 if we want to have any chance in fixing global warming.
The CO2 is what upset the balance and we are by far the biggest contributor there so it makes sense to address that.