According to the ‘Saturated Greenhouse Effect’, a controversial theory developed by Hungarian physicist Ferenc M. Miskolczi, adding carbon dioxide to the atmosphere will result in a reduction in relative specific humidity.
According to data from the NOAA Earth System Research Laboratory, relative humidity has been generally trending down, especially at higher elevations, since 1948.
Notes and Links
The graph is from ‘The Saturated Greenhouse Effect’ by Ken Gregory, a June 2008 article published by The Friends of Science Society, http://www.friendsofscience.org/assets/documents/The_Saturated_Greenhouse_Effect.htm
Click on the above graph for a better/larger view.
Update, Thanks to Nick Stokes for his comment in the thread explaining that the Miskolcki theory only says there can be a reponse of decreased specific humidity in response to warming. A fall in relative humidity is nevertheless consistent with the Miskolczi’s law, but not with the current IPCC-sponsored paradigm.
Update, Following is the graph of specific humidity via Ken Gregory, also please read his comment in the thread that follows.