The sceptical climatologist

"The scepticism that I advocate amounts only to this: (1) that when the experts are agreed, the opposite opinion cannot be held to be certain; (2) that when they are not agreed, no opinion can be regarded as certain by a non-expert; and (3) that when they all hold that no sufficient grounds for a positive opinion exist, the ordinary man would do well to suspend his judgment."

Betrand Russell quoted by Gavin Schmidt in How to be a real sceptic, a useful piece that's been needed for a while.