> megavolcano eruption, coronal mass ejection, and asteroid impact. Even after any of those events, the bottom of the ocean would still be more habitable than

> megavolcano eruption, coronal mass ejection, and asteroid impact. Even after any of those events, the bottom of the ocean would still be more habitable than Mars. > It's not a moral hazard at all; the two outlooks are congruous. The moral hazard is that we'll begin to think of Mars as a backup, when it isn't one at all. The Earth is very likely to be the one shot we have at a home. If we can't manage to make Earth habitable in the face of catastrophe, there is little hope to make a cold, barren rock that's millions of miles away habitable.