I went and saw this movie the other day, and I would highly recommend it... Its not a happy doco, but I'd never quite fully understood what global warming was about, and how serious it is.
In short, if nothing is changed within 50 years, average temperatures will increase a lot. This will cause an increase in natural disasters (cyclones, hurricanes, flooding and fire), and will also cause the ice caps to melt, raising the earths sea levels by more than 6 metres (drowning many major coastal cities, and creating millions of refugees)..
Not to mention all the extinct species, increase in disease and other such death chaos and destruction...
Has anyone else seen it?