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I read the study by Cook et al with great interest [1]. The study used levels of endorsement of global warming as outlined in their table 2; however, I could see no mention as to how these levels were created and how reliable they were in terms of both inter-rater and intra-rater reliability (Cohen's kappa). Best practice on rater reliability indicates that both inter-rater and intra-rater should have been measured and documented in a study such as Dr Cook's [2] and I am surprised that this fact appears to have been neglected. It would be of considerable benefit to readers for some robust rate reliability metrics to be included, if at all possible.
Conflict of interest statement
Funding: The author, his immediate family, and any research foundations with which they are affiliated have not received any financial payments or other benefits from any commercial entity related to the subject of this article.
Competing interests: None declared.