I have seen the film. It is really a poor made film and it shouldn't have won an Oscar.
I think there are a lot of people who get too worked up about this movie. Knowledge is power, and knowing what the movie is talking about gives us as parents insight that we can offer our children.
I believe their is a warming of our planet, but I believe it is from the sun. I also believe that this warming is natural and we can't do anything about it except to adapt.
As for pollution, regardless of whether it causes global warming, we should make efforts to reduce air pollution anyways. I live in the Inland Empire in southern Cal. and I see the crappy air all the time.
Air Pollution Facts
During the past 29 years, air pollution in the United States has dramatically decreased as a result of the combined efforts of government, industry and individuals. Yet, research indicates that the public is largely unaware of this progress and believes that air pollution continues to increase and the air quality is deteriorating. The Foundation aims to educate the public about the great strides that have been made as well as the steps individuals and organizations can take to contribute to continued progress.
http://www.cleanairprogress.org/clean-air-pollution/air-pollution-facts.asp