That movie is nothing but scare tactics. The conclusions it draws are from:
1) simulations of what might occur if the current warming trend continues. (but might not; observe our ability to predict what the weather will be like in a single city tomorrow and then say we can accurately predict the entire planet's climate decades in the future.)
2) Debatable conclusions drawn from legitimate scientific data. (The data is all the same, but you can interpret it in many, many different ways. Just because the majority of people say one conclusion is correct does not make it so. See http://en.wikipedia.org/wiki/Humorism )
3) Flat-out wrong. (not very much of this category, but there are a few cases of it)
For the record, I do think that global warming has a serious potential to cause major problems to Earth's ecosystem, but this movie is just crap.
Not trying to be a fanboy. Of course, it's hard when you own the best console eve... dang it
