Music video with a nuclear winter?

Question

This has been bugging me for years. One time, on MuchMusic, I saw a music video described as follows.
Kids are in some sort of classroom, where their heads are being examined by some sort of doctor. Then, it's time for them to play outside, but they cannot play outside without wearing a special protective suit.
The kids are playing outside with these suits on, and create a ... black snowman, made of black ashes of some sort, like that of a nuclear winter. The kids continue to play happily until one of the children collapses into possibly death (and the helmet of his suit breaks off).
I can't remember any more details, but just that the music was slow and boring, and the video didn't make mainstream. I was disturbed by this video but would still like to know the name of it. Can someone help me by telling me what the name of this rare video and song is?

Answer 1

"Untitled #1" by Sigur Ros
was pretty bizarre. Basically, the world has ended, but humans somehow managed to survive, I guess. It shows kids go out to play while wearing gas masks. The sky is red and the world is completely covered in ash. The kids build an ashman in the same fashion as they would with snow, and do other typical things kids do today.

Here's a link to the video: http://www.ifilm.com/ifilmdetail/2459423