According to the geological records, earth has been around for around 4.5 billion years, although it was mostly molten magma for about half a billion years... The sun is gradually getting hotter and bigger, and over time, even in the absence of global warming — the man-made stuff — the sun will expand and it will overheat the earth. My guess is probably... there is only several hundred million years left.... Basically, if it took an extra 10% longer for conscious life to evolve on earth, it wouldn't evolve at all, because it would have been incinerated by the sun. ... It appears that consciousness is a very rare and precious thing, and we should take whatever steps we can to preserve the light of consciousness, and the window has been open; only now after four and a half billion years is that window open, that's a long time to wait ... I'm pretty optimistic by nature, but there's some chance that window will not be open for long, I think we should become a multi-planet civilization while that window is open, and if we do the I think probable outcome for Earth is even better, because then you know Mars could help Earth one day. And so I think we should really do our very best to become a multi-planet species and to extend consciousness beyond Earth, and we should do it now. Thank you.

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We are used to things improving every year; we are used to having a better cell phone next year than this year; a better lap top. We are even used to some basic things, like we expect more from your car in next year’s model than last year’s model. But this is not the case in space; reliability and cost - those are the fundamental parameters of transportation - have not improved.