The old climate change, page-63

"did you ever think about the fact that evaporation cools things? Clouds are very reflective and dense ones stop huge amounts of the sun’s energy even hitting earth?? "


clouds.....as condensed water.....are very good at absorbing solar energy in the infrared range.....they just happen to do so at an altitude where it is not easily transferred to lower levels

water vapour at ground level.....aka humidity......is where you feel water's heat-absorbing properties the most

the whole "water" vs CO2 argument misses the fact that water and CO2 absorb radiation in different frequency ranges

so increase in either will result in more infrared energy being retained



http://www.ces.fau.edu/nasa/module-2/how-greenhouse-effect-works.php