These are the cities that went under when the sea level rose due to AGW. Atlantean Global Warming.
The sea levels fell during the last ice age, which also reduced or wiped out the people living too close to the poles. Civilization would have flourished on the tropical coasts. And, when the ice age ended and the seas rose again, those civilizations would have been lost. Overland trade routes would have been lost, cities would have been flooded, arable land would have been lost, the climate change would have made growing familiar crops much more difficult, and a scattered remnant would have to relearn hunting and gathering to survive. Maybe.
“Atlantean Global Warming.”
The stste of Georgia should really do something about them.