It is of course an extreme case, but if it meant taking life beyond, and ensuring its future, then I would find it acceptable. I doubt that would be required though.
It doesn't matter who finds it acceptable. It wouldn't be allowed.
Allowed by who? I dont think you understand what I was saying. The people alive today are irrelevant to the issue as humanity isn't capable of this yet.
A major emergency I would guess. That or if climate change was set to destroy us. Building habitats that could hold ecosystems would take a lot of collective effort.
A major emergency like what? Climate change set to destroy us? You're referring to a major kind of catastrophe where we humans are forced to work together or die?