For a few days after reading The Upside of Down, I annoyed most of my friends and family by reciting chunks of Homer-Dixon's work back to them -- I couldn't get it out of my head. I do this a lot to people, but not usually for days and days on end after reading a book.
The Upside of Down isn't an environmental book, exactly, though it does deal with environmental and energy issues. While it shares some themes with more explicitly environmental books (like Jared Diamond's Collapse), the core of the book is more political and sociological. Homer-Dixon is asking why societies collapse -- what are the pressures our society faces today, and what, if any, are the positive results from the kind of collapse he's talking about?
