The continuity argument is a strong one, but it is weakened - in my mind - by assuming sufficient time to colonize anywhere else, while trying to survive on our

The continuity argument is a strong one, but it is weakened - in my mind - by assuming sufficient time to colonize anywhere else, while trying to survive on our current lifeboat. I don't doubt the intent, but I think the timelines do not match, in that we will exhaust resources here (both fundamental and good-will) way before any second colony becomes viable.