As for Humdrum et al. Basically, they are jokes.
We have been very critical of the correspondence of Bye, Humlum, Stordahl. Some might even say harsh. But we must acknowledge that their contributions are very interesting. In fact, their letters provide with a perfect example of the strategies deployed by climate "skeptics" to twist the debate and sow doubt in the minds of the public. BHS articulate their argumentation around the defense of an ideal of scientific method they believe in while clearly violating the rules they pretend to respect. Citing irrelevant quotes or taken out of their context, misunderstanding fundamental concepts, concentrating on precise points without looking at the broad picture, cherry-picking or even inventing scientific facts and data in order to provide with justifications to their hypotheses, etc.
So we would like to thank them from the heart, because they have chosen to be good examples of how science should not be done, how climate science can be at worst when left to the sole hands of so-called climate "skeptics".
http://www.skepticalscience.com/humlum-at-it-again.html