Just saw it last night on DVD.
The most important and obvious point takes place fairly early on, where in order to follow the projected line of CO2 increase, Al Gore gets on a lift in order to rise to the point where CO2 will be in fifty years.
In comparrison, we are given the difference between the temperatures that, nearly exatly, eerily, follow the CO2 level that would result in 2 miles of ice being on top of Manhattan. The difference is, about, 2 feet between this cold world, and the world we lived in when CO2 was in normal range. Now, he had to move up several feet on said lift to show where CO2 would be. At least 10 ft. up. About 5 times the difference that had occurred naturally over the past several hundred years.
This combined with the fact that in all peer reviewed articles ranomly sampled (I believe there were over 900), every single one accepted global warming as happening.
Now, for those who want to know...peer review means that it just isn't any old study, but one that has been looked at by other scientists and found to be goood enough to be put into a journal. So good, that these other scientists put their names behind it.
The movie overcomes any doubt, better than I could, so I simply encourage you to watch, before you dismiss it. Watch before you vote. Read other science journals. Read a science article on global warming, it is scary.
Remember, for 30 years + the tobacco industry told us that smoking was safe and did not cause cancer.