Read here and here. [Upadate 4/6/2011: The below chart is a global representation of satellite data, not a measurement of a specific location, such as the stratosphere over Colorado, for example. For more 'C3' postings regarding greenhouse gases, go here.]
Another failure for the IPCC climate models and the overall CO2 AGW hypothesis that relies on a phantom positive feedback water vapor mechanism - the climate opera is at the curtain call and the phantom is AWOL. (click on image to enlarge)
"Increasing atmospheric CO2 does not by itself result in significant warming. The climate models assume a significant positive feedback of increased water vapor in order to amplify the CO2 effect and achieve the future warming reported by the IPCC....According to the IPCC, “Water vapour is also the most important gaseous source of infrared opacity in the atmosphere, accounting for about 60% of the natural greenhouse effect for clear skies, and provides the largest positive feedback in model projections of climate change.“"