I just finished a good book - it has a neat view of what the world could be like in 30 years. I might have blogged about it before (my Google-fu says nay), but its a really well worth reading - there are some interesting, plausible ideas about the future of society, the environment, and the net. Then I got to the end of the book, where the author is writing his notes about writing a 50-year forward projection, and talking about the end of the Cold War as a current event ... wait a second. A check of the front cover reveals that it was published in 1990 - that's right - we're nearly halfway into the future depicted there, and its still a reasonable idea of what the future will look like. I would definitely recommend reading it if you get the chance - available on Amazon or possibly your local public library (they're wonderful places, incidentally - they even have music and movies nowadays).
And did you really think I'd reccommend a book without mentioning the title or author? Earth, by David Brin, is what you're looking for.