I sort of agree, but "free trade" and "anthropogenic climate change" are very different kinds of things. Climate change is not a policy whereas free trade is.

I sort of agree, but "free trade" and "anthropogenic climate change" are very different kinds of things. Climate change is not a policy whereas free trade is. A better analogy would be between "free trade" and "carbon taxes" or "free trade" and "renewable subsidies." Polling "experts" on policy issues is a different beast than polling them on scienfitific issues.