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I believe, I truly believe, that humans will be living off of this planet, at some point in the future. It's inevitable for us, and it seems like a reasonable and realistic progression for us as a human race. We won't last on this planet - not forever.

I think we have a good chance of surviving long enough to colonize the solar system.

The planet will get better; it's us that won't be here because we'll destroy the environment.

I don't think the planet can survive people. It's not the other way around. I don't think the planet can survive.

Some day we'll move into space and start ensuring the survival of our species beyond Earth, whether it happens in a hundred years or a thousand.

I am confident that life once thrived on Mars and may well still exist there today.

So often we talk about saving the planet, but what we really mean is to save the planet the way it is, so we can live here. So that is can sustain us.

When we get there, if we don't find any life on Mars, from that point on there will be life on Mars because we'll bring it there, whether it's germs and leftover urine bags, whatever it is.

We're going to understand that there is life on other bodies in the solar system.

I don't think the human race will survive the next thousand years, unless we spread into space.