<<Besides, the basis of the movie is that "scientists have reached a consensus" that humans are the main cause of global warming - and virtually all scientists that study global change themselves say that statement is not true.>>
I don't really follow the science of it all that closely, but it sure sounds like someone is playing word games here. Whether the cause is mankind or not, it should be pretty obvious that if it's a problem, then mankind should bestir itself and find the solution. How smart do you have to be to know that dumping billions of tons of toxins and particulate matter into the environment, which may or may not cause global warming but probably does, has got to stop now. The focus on global warming is just a part of it. Toxic pollution is the other part.
I'm also not impressed with the waffling around "reached a consensus" and the "virtually all" that say it's not true. Once they fall short of unanimity, a "consensus" is, semantically, up for grabs. What if it's a solid majority but not a consensus? What if someone denies consensus when there's only one hold-out in a thousand? If there's a reasonably broad majority of informed scientific opinion backing the idea, then as far as I'm concerned, the idea is well enough established for action to be taken on it. (BTW, as I'm sure you already know, "informed" scientific opinion means opinion that agrees with me.)