Right, that's why early civilizations were nomadic and moved when water levels rose or lowered. They also lived near rivers for food and water sources, when the river levels rose, they moved away. Today, everybody wants an ocean view, even Obama. Living on the coast is a choice and sometimes you pay the price for that.
Well, they're not moving tomorrow. They have all the time they need. And, yes infrastructure cost would be significant over time to relocate that many people, but that is our own fault for locating that many people on the coast to begin with. This is entirely a modern human problem. Ancient man was smart enough to not do that.
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