Luke 21:25 And there shall be signs in the sun, and in the moon, and in the stars; and upon the earth distress of nations, with perplexity; the sea and the waves roaring;

You could see that if what this news article says this did happen that with the concentration of population on the coast line, the world would have quite a
problem on its hands with no way out .
Small sea-level changes could pose big problems for Calif. coast | news10.net