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like i pointed out, even if the ice does cause the sea to become 6 meters deeper its would not mean that the sea level would be that much higher on the land.
If I understand your statement, you are correct. At some beaches on the east coast a one foot rise will erode about a hundred feet of beach.

I don't know the answer to this one, but am curious. How high would sea level need to go to reach a subway entrance in NY?

Even if everyone affected in the US was 'rich' (which I disagree with) that was directly affected, it would still be an economic catastrophe.

weather rich or poor, displacing large numbers of people causes hardship. In countries in southeast asia the numbers of people displaced is staggering.