By what mechanism is water vapor increasing to be the primary driver of the warming? We know why co2 is going up. What can cause water vapor to go up and stay u

By what mechanism is water vapor increasing to be the primary driver of the warming? We know why co2 is going up. What can cause water vapor to go up and stay up when it only has a residence time of 72 hour and do you have any peer reviewed work supporting this idea that h2o can be a primary driver of climate?