Eventually 40% to 50 % of the world's population will have to migrate further away from oceans

In other words the homes of 40% to 50% of the world's population will be under water withing 100 to 200 years from now. If you go to places like Miami now whose highest ground elevation is I think 6 feet you see the problem and many places already go underwater at high tide. Another location is Venice which is a problem too already. So, the closer to sea level all cities and homes and islands are the more likely they will be underwater within this century or the next or during storms of one size or another ongoing.

But, I think it is important to realize that the migrations from the Middle East to Europe and the migrations from Central America to the U.S. or Mexico or Canada are also causing the people who have lived in these places people want to migrate to to become more violent towards people trying to migrate to their home countries from other places because they don't want the migrators to steal their jobs or homes.

This is going to be an increasing problem this century and the next as all the snow and ice melts off the planet most of the year and then finally all the time there will be no ice and then we cook like lobsters in a boiling pot or move underground to stay cooler during the days.