about the Iris effect, originally published in 2001. The claimed agreement of existing climate models with reality may be described as curve fitting. There are good reasons to think that there is a couple of important negative feedbacks related to water vapor and clouds that make the CO2 climate sensitivity small.
ABC of the iris effect: when the Earth is warming, the rain at places where air flows in the direction up becomes more intense. This reduces the amount of water droplets available for high-altitude cirrus clouds. Warming thus reduces the number of cirrus clouds and because these clouds have a warming effect, the overall impact of this mechanism is a slight cooling which means that the ultimate warming will be smaller than if the iris effect wouldn't exist.A 2007 paper by Roy Spencer et al. on cirrus clouds brought some new evidence for the iris effect. See also
You may also read a semi-popular text of a lecture by Prof Lindzen called
Given the fact that zetta- doesn't appear in the original paper and the correction systematically misspells zetta- as zeta-, one may conjecture that the correction to the paper was written by a less intelligent but more concerned writer than the original paper.
It's very plausible that there can exist errors and biases but if one looks for them with a particular "big idea" in mind, it is likely that he will get skewed results. And it is hard to avoid the feeling that skewed results are actually the real goal in many cases.
And that's the memo.