Read here. The global warming scientists, major climate research centers, the IPCC, environmental NGOs, and global warming activists and pundits have all claimed that the "robust & rigorous" climate models prove that when human CO2 increases, then global atmospheric temperatures will have to increase, which will then cause surface water evaporation to increase, that subsequently causes water vapor in the atmosphere to increase, which finally sets in motion a positive feedback system that causes all the previous items to even increase more, ad nauseum. Unfortunately, the "expert" climate scientists are now discovering those models might not have it quite right, since atmospheric water vapor is doing the exact opposite of what the climate models predicted! Gee, what a surprise.
"“Current climate models do a remarkable job on water vapor near the surface. But this is different — it’s a thin wedge of the upper atmosphere that packs a wallop from one decade to the next in a way we didn’t expect,” says Susan Solomon, NOAA senior scientist and first author of the study....Since 2000, water vapor in the stratosphere decreased by about 10 percent. The reason for the recent decline in water vapor is unknown."
