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That's the one I was looking for!

This is a sight this is entertaining as well as informative, in a tongue-in-cheek sort of way. It's called Exit Mundi and it details end of the world scenarios for different times, present day, near...

I thought I remembered seeing another more detailed letter or report on the site, but I can't find or recall it right now.

There's this little tidbit I remembered reading from the PC site:

http://projectcamelot.org/electrical_engineer.html

There's also a snippet of information on a "wave" in this one:
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