The distinction between true scepticism and denial

Indeed so. Good luck, would-be contributor!

The second set is for scientists who might be "approached by a member of the public seeking critical engagement". The Guidelines tell you to be careful — you might be approached by someone who is not in good faith, and wants to find errors in your work. Don’t help them!

And when you’ve finished both guidelines, you still don’t know what the authors think a ‘true sceptic’ is, or how he or she is to be distinguished from a ‘denialist’. Yet that is embodied in the title of the article.

Finally, the authors. The first two names will be familiar to readers of this website, and indeed to anyone interested in the ‘climate change’ issue: Stephan Lewandowsky, Michael E. Mann, Nicholas J. L. Brown and Harris Friedman. You will learn about the third and fourth by reading the article. They seem somewhat more sensible than the first two. Oh, there are 96 references, of which 22 are self-referenced articles, 16 of them by Lewandowsky alone. I may be wrong, but I could find just three references that were critical of the authors’ standpoint. Not exactly a review paper, for all its pretension.

And I find myself saying, yet again, this  awful, poorly argued, self-seeking paper has passed peer review? What have we come to in the journal world?