Doors on a house is a bit different from walls around an arbitrary country. But it is much better to help people where they are than to let them uproot. The reality is that many places where people have traditionally lived are becoming uninhabitable.
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It is a slight random miracle that we are headed for a solar super grand minimum for the next 20 years which will help buy us some time to figure it out before we really start seeing days of wet bulb temps of 95F/ 35C which is lethal if you don't have some way to cool off.
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