eh..to be honest, I think you might have 'garbage mining'..going through old landfills for recycling purposes..and, as another thing, we'd be working with some alternative fuels and energy sources (if the price of oil goes high enough, eventually other things become economically feasible..coal gasification, solar, etc)
I think one thing that will be different is the ethnic makeup of the World..the 3rd world has been migrating north for 20 years, and after a century of that, our culture and outlook would have changed..life in the Estados Unidos might be completely different. The Middle Class may be a temporary phenomenon, or not..one thing, since I'm Osama's age (give or take a few months)..they might find him, but we'll both be a little bony (what, about 120 or so) by then..;) Just don't let all the speculating keep ya from modeling...;)

I wish I'd said that.. The Staircase Wit

anahl nathrak uth vas betude doth yel dyenvey..;)