Well, it might not be the most terrifying but it certainly does a good job explaining the climate change issues we all face.
Check out this video on youtube: http://www.youtube.com/watch?v=zORv8wwiadQ.
An alternative link is:http://green.yahoo.com/blog/ecogeek/244/high-school-teacher-spreads-the-word-on-climate-change.html.
What may be the scariest thing about the youtube post is the comments. For anyone who thinks that 'consensus' on climate change has been achieved, there is obviously a lot of education left to be done.