A disastrous homework...

Challenge students to identify a top 10 of films which feature disasters or other risks to the planet. For example, one of the risks that we face (a very real one) is asteroid impact.
This has the potential to wipe out the human race, but fortunately the probability is quite low...

This film is based on this risk... It's one of several in the King's Geography Department DVD library, which is quite extensive...

What other disaster movies can you think of based on other natural phenomena or human activity that pose a risk ?
Who can create the most creative movie list??