This seems uncharacteristic of Shermer. He, of course, is not the only one. In fact, most debate, and AGW debate in particular, has this character: the propone

This seems uncharacteristic of Shermer. He, of course, is not the only one. In fact, most debate, and AGW debate in particular, has this character: the proponent claims overwhelming evidence, but shows none. It's like playing poker with someone who wants to claim the winnings without showing you their hand. I would prefer to see more "How I was convinced..." type of stuff. I've seen more of that on the side of the skeptics/deniers, probably because they are the underdog, and so more likely to be forthcoming. It doesn't make them right, but it does coerce them into being better proponents.