Modern humans have been around only 200-300k years. Industrialization started 130 years ago or so. Getting off the planet in the next 600 million years is a mu

Modern humans have been around only 200-300k years. Industrialization started 130 years ago or so. Getting off the planet in the next 600 million years is a much, much smaller concern than how we can actually keep the species going in the immediate future. While, yes, at some point we need a 'plan B' to earth, the reality is we still first need a plan A; despite how far away we are from it, we are much closer to being able to maintain equilibrium on this planet than we are to colonizing another (and if we don't fix the first in a relatively short period, but somehow manage the second, we just doom two planets anyway).