Space should be a much lower priority than climate change. There's not as much excitement or fun in it, but it's about a million times more pressing.
I would think the energy and infrastructure requirements to move most industry off-planet, integrate it with terrestrial civilization at scale, and maintain continuous growth, would be far more environmentally damaging than simply keeping it all on Earth.
You don't need to move the entire industry off-planet physically to reach a state where there is little industry on-planet and lots of industry off-planet. Tools can be made in space with materials on-hand up there. With those, you can get access to more materials (asteroid mining), and build more tools, more industry, etc.
The only real barrier right now is efficient transportation. Ion drives look poised to solve that problem.
Besides, all of the resources we pour into forcing the climate to not change (which would be unprecedented!) are all for naught when that asteroid hits.
...actually precedented by all the resources we pour into forcing the climate TO change.
And, asteroid, seriously? This is the best we can do now? May as well not eat meals anymore because hey I could get hit by a bus on the way to work.
Hiding in space from an asteroid strike is a bad plan. Earth during an impact winter is still much much more habitable than anywhere else in the solar system.