[lisper]

> Mars presents an opportunity to continue the human race in an event of cataclysmic proportions (like another massive asteroid strike, the Yellowstone caldera erupting at a scale we hadn't anticipated, or global warming making Earth generally uninhabitable).

Even in a worst-case scenario we're better off here. We have a pretty good idea where all the dinosaur-killer-sized asteroids are and none of them are on a collision course with earth. There is the possibility of a medium-size rock causing some very serious damage to infrastructure, but it's not going to make us go extinct. Likewise for volcanic activity. Even a dinosaur-killer-sized rock is survivable (for the species, not for civilization) by moving underground for a while until the dust settles.

Global warming is an existential threat to civilization, but not to homo sapiens as a species. We may have to go back to being hunter-gatherers in northern latitudes, but again, it's not going to make us go extinct.

Homo sapiens are just damned tough to exterminate.