True. Which brings up another regrettable thing about his ignorant bloviations on climate science: they essentially spoiled the one good point he had to make. Namely, the issue of unquestioning acceptance of the AGW hypothesis by many people who don’t know anything at all about the science, and have no concept of the comparative reliability and uncertainty of its different parts.
Cockburn could have written a very good article, or series of articles, on the extent to which a lot of leftists and liberals are dogmatically convinced that AGW is a serious environmental problem, despite not really understanding anything about it. Unfortunately, he sacrificed that opportunity in favor of trumpeting his own dogmatic conviction that AGW is nonexistent, despite his not really understanding anything about it.