I had no idea that An Inconvenient Truth has only just come out in the UK. I got a chance to see it a couple of months back at a film festival (since when is NZ ahead of the UK?!) and I really recommend it. It's funny to think what the world would be like if Al Gore had only won that election! It is a very well put together documentary and he is a very good speaker. Even if you don't usually go to see documentaries at the cinema, go see this one - if we make it a box-office hit maybe then governments will listen.
There are many who doubt the existance of man-made climate change and as is always the case in science, it's much easier to disprove than to prove a concept. However even if you're not convinced, the changes that are needed are not necessarily that large, and the catastrophe that would face us if the scientists are proved right is too disasterous to play chance with. Go see this movie, then sell your SUV and get on your bike or hybrid car if you really must be one step ahead of the Jones'!