How Do You Deal with People Who Won’t Admit That the Sea Level Hasn’t Risen Not Mentioning Last Time of Moses?

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The leftist wackos of the manmade climate change scare-campaign will not admit that the sea level has not risen in modern times (shore erosion and urbanization-caused subsidence rightly excluded), nor in ancient times after the Ice Age had ended circa 1400 b. c. when the sea level had risen a few hundred feet to submerge many manmade structures on the shallow seafloor ever since.