Especially idiots. Good thread over at WUWT; or, at least, it chills out a couple of my pettest of peeves--the hysteria over alleged overpopulation, and the all-too-common claim (both advanced even by AGW sceptics) that we're running out of (fill in the blank). There's a guy commenting there under the nom de doof "GM" who is a Malthusian's Malthusian. He thinks human population should be 100 million or less and constantly uses my new-fave meaningless term: "ecological overshoot."
The (Julian) Simonists tear him up. Not, like the Black Knight, that he notices.