Well said! I've been in my cge environment for too long lol, all I ever see is the humidity I set the dehumidifier to. But you are absolutley right, more transpiration = more humidity.Co2 does affect the plants in your room causing higher humidity lvls. When your plants receive enough co2 to boost it's original state, the transpiration goes up. Transpiration is the process in which your leaves transpire water into the air and receive new water through the stoma after the prior water in the leaves have transpiration. By adding higher lvl's of co2 in the air you are in turn creating more humidity in your growing space.