There are also extinction events that might actually be caused by our own technological So being multi-planetary would insure ourselves against that as I feel like you went in trying to nitpick his He made a hell of a lot of good points, including the argument that it's the next step for human Just because we don't *need* to leave Earth doesn't mean we EDIT: Also, re the climate change point, Elon is acutely aware of the human impact - which is why he started a car company aimed at drastically reducing or eliminating one of the major sources of greenhouse gas