Comment Re:Build colonies on Earth (Score 5, Interesting) 256
By the time off-world colonies are viable, pollution on Earth will be a non-issue, because the exact same technology needed to sustain an offworld colony is the technology that would allow us to clean and recycle absolutely everything here on Earth. Because that's exactly what you need for a self-sustaining offworld colony: recycled everything. On Earth, we're lucky enough to have a natural biosphere that gives us tons of recycling capacity for free: just dump wastewaster and CO2 and feces into the wilderness and, like a miracle, fresh air blows back, clean water falls from the sky, and food grows out of what was once someone's shit. Up to a certain capacity at least. If we can't even manage to recycle the excess of ours that that massive free hand up nature gives us can't handle, then we're nowhere close to being able to settle offworld where we have to do all of that work ourselves.
Like you say, Antarctica or the desert or, hell, the ocean floor, would all be a cakewalk compared to anywhere off Earth.
There is good reason to settle offworld when we can (not keeping all our eggs in one basket), but until we're capable of even settling all of the comparably idyllic places on our own planet that aren't "worth settling" at the current difficulty levels, then we don't stand a chance of settling anywhere offworld.