Paella
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Very good beo, I see that you've googled the phrase I asked you to enlighten us on and quoted two of the sites that come up on the first page. Now I would not have thought that someone with your expansive scientific knowledge would need to google infrared absorption of CO2, but I'm glad you did, because at least now you'll know something about the topic, even if it is from denialists.
As for me enlightening you for a change (a tall order I know, given your apparent mastery of the subject - muso must be envious), but anyway: The saturation theory enunciated on the second site first appeared in the formulation stages of the AGW hypothesis, back in the sixties - or even earlier perhaps. It was raised out of genuine enquiry, by scientists who were more interested in trying to understand absorption rather than gain insights into climatology. The theory was that as the emissions spectra of water vapour and carbon dioxide overlapped, carbon dioxide could only block IR radiation that was already blocked anyway, and would therefore not contribute to the blocking of the Earth's BBR. However, it was soon found that the degree of the overlap was misunderstood and overstated, so that theory died. It was long forgotten, until denialist pseudo-scientists stumbled on it and thought they'd try to give it a bit of a kick start.
Honestly, one of the silliest things about denialist theories is how very simplistic they are. If something as basic as this had any credibility, don't you think genuine researchers would be on to it? To believe otherwise requires one to subscribe to the global scientific conspiracy theory. The posting of those two links suggests to me that you possible do believe in the global scientific conspiracy theory.
You obviously have a penchant for those theories that are not supported by any evidence whatsoever. What's your star sign?
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