Songs of t'Apocalypse

What would you put on a compilation album of songs about the end of the world?
Excluding various strands of thrash/death/goth metal, natch.

No-brainers
"It's the end of the world as we know it" by REM
"The End" by the Doors
"We don't need another hero (Beyond Thunderdome)" by Tina Turner
"99 Luft Balloons" by Nena
"The Future" by Leonard Cohen

Less well-known/tenuous/tendentious
"Here at the End of the World" by David Rovics
"It's too late" by Carole King
"We'll all go together when we go" by Tom Lehrer

And this blog post on the same theme recommends "When the Man Comes Around" by Johnny Cash