Entropy

I found an interesting site promoting a book, "The World Without Us", that might give you an idea of what parts of the AtB world may be like 75-80 years after the Big Death.

http://www.worldwithoutus.com/did_you_know.html

Actually, the site and book go quite a bit further than what the world would be like after just 80 years, but it still gives you an idea of how things would fall apart as the years go by without the amount of maintenance we provide to keep it standing.

However, IMHO, I feel that the author, Alan Weisman, doesn't give nature enough credit at how fast it would reclaim the lands. Of course in a world like that which is the setting for "After the Bomb" we aren't constrained by the "natural order of things" and can have the pre-Death civilization crumble fast or slower than that which is suggested here, but it does give one an idea of how things might happen...

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