Populations might move uphill if they are unfamiliar with "dike" technology. About one third of the Netherlands lies below sea level, with the lowest point bein

Populations might move uphill if they are unfamiliar with "dike" technology. About one third of the Netherlands lies below sea level, with the lowest point being 22 feet (6.7 meters) below sea level. Perhaps other nations might be capable of building small walls to keep the sea back as well.