Yes, warmer liquid holds less gas. The dependence shows up in the temperature dependence of the Henry constant, see
http://en.wikipedia.org/wiki/Henry%27s_Law The fluctuations from the sun explain a lot of the warming in the 80's and 90's as I explained above. There is also a steady increase due to CO2. The reason is that CO2 absorbs some wavelengths of IR that water vapor does not and increasing the CO2 causes a small increase in the temperature of the atmosphere.
The warming inside a greenhouse is partly due to trapping the warm air (preventing convection). The rest is due to the absorption of outgoing IR by the glass, just like CO2 in the atmosphere. The glass then emits about 1/2 of that heat back into the greenhouse. The water vapor inside the greenhouse helps hold some heat too but that is mostly an increase in thermal mass. It is even better to have many gallons of water in the greenhouse for thermal mass to hold the heat through the night or cloudy days.
I've read compelling arguments that refute the greenhouse effect altogether. Your numbers on CO2 absorption are bullshit. I would go so far as to call them a lie. Linking me to anthropogenic greenhouse warming links does not help your case. I've shown you, with 2 bottles or cans, that something else is going on. Refute my eternal observation before I read your paid plant.