"I'm pretty sure the people at the height of Easter Island thought their technology conveyed some sort of invincibility on them as well. If humanity is ever to think of itself as immune from the limitation of planet Earth it will only be on the day that mankind had made itself independent of planet earth. And that day is a very long way off. So as a species we are in a race. Can a technical species with no restrictions on its population growth reach the ability to survive and thrive in the common environments found in reachable space before the inevitable crash from overpopulation?"