If there are humans in space habitats and (better) on transit with colonisation ships to other star systems, the climate of our homeworld doesn't really matter

If there are humans in space habitats and (better) on transit with colonisation ships to other star systems, the climate of our homeworld doesn't really matter for the survival of the species. Still, it's much better to solve both. Especially since space technology is still in its infancy. Abandoning either would be a folly.