I've only watched about 24 minutes of this 2+ hour video, but it looks like a target-rich environment for skeptical bloggers. Around the 13:00 mark, Donald Brown talks about 15 unspecified lines of evidence for human causation, and thousands of other lines of evidence.
Around 23:00, Brown starts raving about a site that may be Climate Depot
"Here is the video for the free presentation given on April 30, 2012 on Penn State's University Park Campus. Penn State professors Michael Mann, Donald Brown, Janet Swim and Rick Schuhmann, and graduate student Peter Buckland spoke Monday evening at "Changing the Moral Climate on Climate Change," a talk that focused on climate change denial"