Just saw the movie "The Road", while it is grim, I like the lack of crazy scenes of destruction, they never really say what happened, but things are changed forever, people are moving, dying, surviving. It is VERY VERY matter of fact in what it would be like to try to survive a life/ planet altering event (at least as I see one scenario, as they are obviously limitless), there is cannibalism, killing, hunting of weaker people, etc.... Certainnly gets you thinking.

Just thought others might gain perspective by watching it.

http://www.imdb.com/title/tt0898367/

Ironwood