The latest Living Planet Report produced every couple of years by WWF, the Zoological Society of London and the Global Footprint Network, measures the health of the planet's ecosystems and the extent of human demand on them.
In summary this 2008 "human demands on the world's natural capital measure nearly a third more than earth can sustain."
We have an increasingly start choice - do we just let competition sort it out (and would the "fittest" survive?) or do we collaborate to sort it out together, as we naked apes are supposed to be able to do? Whatever kind of society we want we don't have much time to ponder. Andy Dufrein's "get busy living or get busy dying" (Shawshank Redemption) has some resonance for humanity.