Science! Global warming occurs, leading to world-wide catastrophes and culminating in a new ice age… over the course of a few days.
Wait... what? The factual inaccuracies were so great in this movie that, when asked, NASA refused to help in its filming. The worst offenders are the melting of the world's ice caps, which would actually take several years and would still not cause the kind of tsunami seen in the film, and the sight of Jake Gyllenhaal being chased by killer frost. No.