Continuing with my trend to recommend books :) the two thought provoking books below in my opinion are essential. I'm convinced that if everyone in the 'first world' read them once in a life time (the sooner the better) we would all probably live in a much better and long lasting World.
The first is "Cosmos" by Carl Sagan.
And once we re-think on from where we come from and what's our place in the Universe, then we may concentrate locally in our still beautiful planet by reading "The Next World War: Tribes, Cities, Nations, and Ecological Decline" and hopefully take some action.
And there's a DVD edition of Cosmos too No excuses :)