"I have full faith in people. I think that we have the ability to change. We're habitual creatures. Once we figure out that bad habit and identify it, whether it's behavioral or whatever it may be, we change our habits. Obviously, I'm simplifying it and making it sound very easy to do, and we all know it's very difficult, but it's doable."

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Our population and our use of the finite resources of planet Earth are growing exponentially, along with our technical ability to change the environment for good or ill. But our genetic code still carries the selfish and aggressive instincts that were of survival advantage in the past. It will be difficult enough to avoid disaster in the next hundred years, let alone the next thousand or million. Our only chance of long term survival, is not to remain inward looking on planet Earth, but to spread out into space.

— Stephen Hawking