"I know Elon [Musk], and we're very like-minded in many ways. We're not conceptual twins. One of the things I want us to do is to go to Mars, but for me it's one of the things. He's singularly focused on that... For me, I don't find that 'Plan B' idea motivating. I find nothing wrong with that. I think it's good when the world has lots of different motivations, but I don't want a Plan B for Earth. I want Plan B to be make sure Plan A works. I think you go to space to save Earth."
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