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Message: <blockquote data-quote="Umbran" data-source="post: 7913295" data-attributes="member: 177">That's not necessarily true.It is possible, for example, for Earth to be set on a route to runaway greenhouse conditions, which no power mankind has can stop.You can compare this to a planet that is currently of decent climate, but has too little oxygen in the atmosphere, that really only needs introduction of oxygen-producing plants to turn it over.However, really the best argument for colonizing other worlds is not about man-made climate change.  It is about things farther out of our control.  Asteroid strike is an excellent example, though we've had volcanic events on Earth in the past that would also do the trick - a thing that causes such destruction on the Earth such that, if all humans are on the Earth, the ability to recover is destroyed.</blockquote>