Considering the cost and fuel involved in getting something into space, it's save to say that most humans alive today will never leave the planet. Even if we s

Considering the cost and fuel involved in getting something into space, it's save to say that most humans alive today will never leave the planet. Even if we somehow acquired the material science to build something like a space tether, there's a minuscule chance a project like that would be completed within the lifetime of anyone reading this. And we'd still need way more than one tether to move humanity at scale. We are on our way to causing a mass extinction event way before we become space-faring at scale. And if we somehow managed to move humanity to space we would still need to make another planet habitable. And what would be the point of that colossal exercise when we got a perfectly good planet right here and just not destroying it is many many magnitudes easier.