Is it hype or simply education? He is spreading the word that global warming is happening so that everyone can alter their behaviour accordingly - no good just telling a couple of people - so he has to make an impact. The problem comes when people start to argue against it but take a look at who is arguing against it and question what their motives are.
The doubt is being brought in by the government (think he was getting at the American government there, not ours) and by tabloid newspapers, probably from reports by the government.
They did a survery of 936 articles in scientific journals about global warming and every single one of them agreed that it was happening and that we should be doing something about it. They then did a survery of 600+ tabloid newspapers and in 53% of them there was a story about doubt - where did this doubt come from when all of the experts are saying categorically that it is happening. This is why the film is called The Inconvenient Truth - it is inconvenient because it affects industry, business and the dollar, all of which have a huge influence on the government!
I would suggest Lampman that you go and see the film which can answer this far better than I can. You might want to have a look at the website
http://www.climatecrisis.net/