I think you're seriously failing to apply the Principle of Charity here. Do you think I assume that anyone who claims to "believe in the theory of evolution" understands it well?

RobbBB has already summed up why the levels of certainty shown in this survey would be anomalous when looked at purely from an "awareness of information" perspective, which is why I think that it would be pretty astonishing if lack of information were actually responsible.

AGW is a highly politicized issue, but then, so is evolution, and the controversy on evolution isn't reflected among the membership of Less Wrong, because people aligned with the bundle of political beliefs which are opposed to it are barely represented here. I would not have predicted in advance that such a level of controversy on AGW would be reflected among the population of Less Wrong.