The joke is on them. It turns out that the presentation is quite excellent! (Well, except that it's a Microsoft PowerPoint (with heavy use of Comic Sans) but if you can put up with that, here you go.)
h/t Baron von Monckhofen
Update: Apparently my impression relayed above that Scott Denning spoke to the Heartland Institute on the basis of some subterfuge, was incorrect. I apologize to all concerned.
I remain convinced that his slides are an excellent introduction to the science behind the concerns about climate change. I also think that his remarks to the plenary, kindly linked by Jim Lakely in the comments below, are extraordinarily insightful and helpful. I recommend careful attention to what he is saying to anyone interested in these matters.