"I think most people do not imagine how things can change. In Detroit, there are community gardens that are only an indication that the country is coming back to the city. And that is something that actually is necessary to stop the real imminent danger of the extermination of our planet."

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Did the Pilgrims on the Mayflower sit around Plymouth Rock waiting for a return trip? They came here to settle. And that's what we should be doing on Mars. When you go to Mars, you need to have made the decision that you're there permanently. The more people we have there, the more it can become a sustaining environment. Except for very rare exceptions, the people who go to Mars shouldn't be coming back. Once you get on the surface, you're there.

— Buzz Aldrin