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I could have sworn that the reason Mars is dead is because its core is no longer molten. As a result, it has no magnetic field to keep its atmosphere from being blown away by solar wind. If that's the case, warming it up would be a pretty difficult feat to pull off. As for thinking about the consequences of our actions, I agree that when it comes to the grand scheme of things it's a pretty important safety. I'm sure though that we've had more scientific breakthroughs than we can even figure all because someone said "Hmm, I wonder what would happen if I pull this off."