Interesting piece, I must say. I have only heard of a couple scientists within that film, including one who has written one of my meteorology textbooks. The meteorology presented was pretty much spot on to my knowledge, but I'm not entirely sure about the atmospheric chemistry or paleo-climatology facts, so it's hard to say.
The one piece of evidence the film did not present was the effects of Methane on the Ozone layer. Methane is a far more harmful Greenhouse Gas than Carbon Dioxide, and the gas is emitted into the atmosphere from landfills, energy production, waste treatment, and of course livestock. The rise in atmospheric Methane levels has been increasing in a similar fashion to Carbon Dioxide levels, so one should take into mind this harmful player while discussing possible climate change. Personally, I don't really have much knowledge in this area either.
This film seems to be quite the "Gore debunker", and while I haven't seen Gore's piece, this probably has more scientific backing. But it is very hard to discern what goes into some of these studies, how much editing has a play, or why they didn't discuss the more harmful player in the atmosphere.
What is for certain, though, is that those who believe that many of the current world crises are manufactured for one purpose or another now have even more evidence to back their claims. I'm not sure how much possible Global Warming discussion goes into limiting the growth of Africa, and they don't give much evidence behind their claims, so who knows. But those who thoroughly believe in the NWO... they'll go nuts over this film.
It could just be about science we do not understand yet.