Heh. Me personally, I wouldn't call that a short term goal. It is possible that the Earth may become unlivable for humanity within our lifetimes, but the actual cessasion of the planet itself is far beyond our ability for destruction (http://qntm.org/destroy), and won't happen naturally for a good long time, barring act of God.

A few dozen billion years isn't really what I'd choose to call "short-term"