Roger Coppock wrote:
On Apr 5, 9:09 pm, Peter Franks wrote:
Roger Coppock wrote:
Classic global warming theory from Arrhenius predicts
greater warming rates in dry areas like the American West
and heartland than more most regions.
Why?

It's called "IR band saturation."
Water vapor and CO2 share parts of the IR spectrum.
CO2 has therefore greater effects in low humidity areas.

Hmm, that doesn't make sense.

Since the effect of CO2 is only partially (20-30%) responsible for
warming (the remaining effect is due to water vapor and 'forcing'), the
lower the humidity, the less the forcing effect, and therefore, warming
should be less...