Anyway, here they are:
Massive volcanic eruptions – like what may have happened on Mars or what was responsible for the Indian subcontinent
Nuclear war – and the nuclear winter such a war would cause, just like we were told when we were kids
Black Hole – Oh I’ve got comments, but I’m gonna keep them to myself
Expanding Sun – not to worry; we’ll be boiled off long before the earth falls into the sun
So far there has been no word on Tom Cruise’s role in all of this.