i beleive that we so much in the future becomes irelevent to us. most people cant imagine the world in ten years, so when the figure one billion presents itself, the first thought is "i wont be alive then." this is what sepperates us from the animals. we think of ourselves as individuals rather than a species. humans as we exist today cannot continue for more than a thousand years, as the resorces we posses are far less than are needed. as for a billion years, we stand no chance of survival for that long, no other creature has done it. and if we are distroyed, oh well life goes on