I started reading a book today called Deep Future by an author called Stephen Baxter.
It was printed in 2001 I think, but there is also a 2002 publish date too so it may have been redone.
Its a book about the possible future of the world and has several interesting theories about what the world may be like in the far future. Ive only read a few chapters so far, but its definately worth reading.
Im not sure what category to say it is, but I got it from the information section in my local library. The back of the book has a sticker saying non fiction on it.