There are so many areas where there is still real uncertainty, where there is legitimate debate that occurs in good faith. That's expressed in the peer-reviewed literature and in the debates that scientists have with each other at scientific meetings.
Fair-minded promoter of free open debate in the peer reviewed literature, Michael E Mann, quoted at the Atlantic.
While it was easy to make sure that the worst papers . . . didn’t see the light of the day at [Journal of Climate], it was inevitable that such papers might slip through the cracks at GRL.
An apparently unrelated Michael E Mann in the Climategate emails.