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I would rather have Islamic state running around than people from new York City.
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Be careful what you wish for!
Is this the correct thread for solutions?
He looks at these solutions for economic viability, which is good. I'd heard of concrete that sucks CO2 out of the air as it cures. But I hadn't heard about parking an asteroid at the L1 Lagrange Point and turning it into a dust cloud. That's brilliant.