Yes, but we're talking about a couple of billion people migrating. It'll be Hell.
Most of the unsettled lands are less than suitable for human life. The suitable lands are rather limited.Most of the landmass on earth is unsettled. I think the apocalysm is hardly called for.
We can and should be control the environment or at the very least its effects on us. Look at the Dutch, they've been giving rising sea levels a finger for centuries now. They have a country where the North Sea should be. That is control over the environment. We can do that now on a grander scale if we take the problem seriously enough.
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