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"We literally are the top of the pyramid of life in the universe, as far as we know. At least in this corner of the universe, we're it. And it seems to me that we have collectively a certain responsibility to see this incredible experiment in life continue. It seems to me there is a kind of obligation, since we're self-reflective beings, to take some responsibility for the future. It's not something to lose sleep over, but safeguarding the future of life, that's something worth working on."
Hear, hear! By the way, his organization dedicated to identifying and preparing for near-Earth asteroids is the B612 Foundation. Check it out.