"There's a strange symmetry at work here: if Earth becomes intolerably hot within the next 100-200 years, we might discover that Mars has taken the first steps toward effectively terraforming itself, making it that much more important in terms of human settlement. Ironically, our trashing of Earth's climate may hasten our first efforts to colonize Mars, thereby helping to ensure the human legacy isn't wiped out in some quite unguessable orgy of destruction."
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