DVD. I used it today as an introductory vehicle for future lessons on climate change and global warming. I had never seen it before and always suspected that, as usual, the hype had to do with the subject and not the construction and i wasn't mistaken. I didn't know that on the way there were several deviations to the protagonist's magnificence - and the way it's done is debatable. Very much so. Just pedagogical.
Give me 20 years and I'll be ready to rate this either one star or five stars. I'm not a scientist, so I'm not going to pretend I understand the complexities of global warming. Until we see overwhelming evidence for or against the theory, the liberals will believe what the liberals tell them, the conservatives will believe what the conservatives tell them, and both will think the others have been brainwashed.