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Perhaps if the desert didn't cool down at night anymore than the florida swamp, you might have a case.
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This is unrelated as i suspect you know!
The desert is cooled so dramatically due to loss of radiant heat to the sky.
Your right any warming process will increase CO2 in the atmosphere, including putting CO2 into the atmosphere, which is a warming influence on the atmosphere, also as you know as air warms in can evapourate more water vapour, this causes a drop in relative humidity when the amount of water vapur is limited (in a box), however in system like the globe the RH remains relative stable overall, however the actual water in the air is greater, this mechanism is true of any warming as you say and amplifies any warming, and the reverse is true cool, less water vapour, cooling and drying of the atmosphere, the world became significantly drier after Pinotubo. None of this however removes from the fact that man has put enough CO2 into the atmosphere to raise it by 100ppm, taking into account all the sinks etc, this can not be dismissed, this amount of CO2 has been released and is still being released.
Also as you know in every log curve an initial increase in X causes a far greater relative increase in Y than the same increase in X once the curve has developed and therefore the initial doubling of X (CO2) has a far greater effect than the next doubling and we are still in the first doubling.
Considering all the natural variations in the climate have been arround since time when and the fluctations in global (not regional) have never occurred so fast as now when there isn't a coalessence of natural forcings present how do account for this event being so so so rapid or are you the type to cast doubt on temperature records etc. There is no natural forcing at present to account for this unique warming event and all the natural forcings present today have always been present, why is this time so unique, for me it is because man as caused a baseline parameter of a chaotic system to increase dramatically and increase its effect by 60% in the last 40 years or so, CO2 forcing was only 1W/m2 in 1950's now its ~1.6w/m2, that is a big increase when you consider an increase or decrease in the suns forcing of 0.2w/m2 can cause to flip from ice age to no ice through the chaos feedbacks.
To throw a daft example like your deserts at you,
When it is a cloudy night here where i live it is hotter at night in the winter and colder when there are no clouds, hurray clouds are warming the earth!!!!!!!!! proven maybe not.
Although it is known the higher clouds are warming and lower clouds are cooling and the trends at present due to warming we are seeing is causing clouds to lift and become warming influences, although overall at present the influence of cloud is basically neutral when all types of clouds are taken into account.
Again as said already this is going over the same old ground as has been covered several times in this thread already.
We should really start talkng about adaptation, mitigation aint going to happen, man will burn all the fossil fuels available to him however convincing the evidence is or not if you receive a salary from an oil comapny, china isn't going to stop, nor indina nor malaysia, Brasil will keep cutting dwnn the rainforest, etc,et,, man is greedy and self centered so what we need to be doing is accepting man is capable of doing this and finding a way to adapt once the shit hits the fan, the average yearly rise in temp for the last fifteen years is 0.03C, this is an acceleration, ice is melting very quickly, seasons are changing, species are migrating, levles of fauna and flora are falling dramatically, excuse man if like if you can't take the guilt that is up to you and cbacba is right that increasing temp increases CO2 through natural feedbacks, we have no chance of stopping this event, and it has recently been reported that the effect of CO2 on atmospheric warming always(throughout history) has been underestimated..........................CO2 is the cause get over it and lets do something sensible about it.