How Do You Start a Fire With Ice?

The link is dead.

I seem to recall this was a challenge question a long time ago, back when I was just an occasional guest here. As I recall the trick was to make a magnifying lens out of ice and use the lens to ignite some kindling using the sun's rays.

The ice magnifying lens is one approach. I found that asking for ice cubes in your glass of La Romanée Conti has made flames appear in the most unusual parts of a sommelier.

Metallic sodium works well, too.

I have seen pictures of ice burning. It has methane locked in. Methane hydrates. See methane calthrate in Wikipedia.

The link works for me & they do indeed make an ice lens.

Yep; they fixed the link.

That was one of the puzzles Anthony Hopkins posed in The Edge