Wood Romances

In a recent talk  (relevant excerpt from John Shewchuk  here ) given to an Australian political group called the Institute for Public Affairs (IPA), William Happer argued that doubling CO2 causes only 0.71 K warming, and that amount of warming for 2xCO2 is too small to matter. He then suggests that in order to make CO2 a problem, scientists had to invent giant feedbacks to amplify warming by as much as 10x the amount caused by CO2 alone. I've seen this claim repeated by others on X and other social media platforms, but as best I can tell Happer originates this particular argument. So I'd like to consider, is this plausible at all? I think it's pretty easy to investigate this and show conclusively that it is not. In fact, even Happer disagreed with this claim as recently as 2020. Ranges for ECS/TCR in IPCC Reports Happer's Argument At about the 1 minute mark of the above linked excerpt, Happer explains his math on how he arrives at 0.71 K for equilibrium climate sensitiv...

W. A. van Wijngaarden and William Happer (WH) have periodically attempted to circumvent publishing manuscripts in peer-reviewed journals and have instead taken to uploading manuscripts on the arXiv. As I understand it, the intended use for the arXiv is to allow pre-published manuscripts to be read and evaluated by scientists before the peer-review process is completed. This gives scientists faster access to the newest research, but with the caveat that these manuscripts may need to be revised significantly before being published, once going through the peer review process. Some may not even be published at all, so scientists often look at these manuscripts with interest but also with a grain of salt until the final version passes peer review. WH are apparently using the arXiv to store manuscripts for which they have no intention of submitting to any peer-reviewed journal. The manuscripts are formatted to look like scientific papers, but they will never see the light of day in an ac...