Humanity residing along the coastal terrains and islands should start relocating by now. The governmental system will not start any form of migration for the general populace because no countries/nations will accept refugees by the millions. This is a logical perception.
The ice caps will melt and we can’t deny those facts. The Earth’s crust is moving and recreating the surface. Sea and river levels will rise according to where the water is originating from .. all these happened before for aeons and we can’t continue to stay ‘ignorant’ of all these natural evolution of Mother Earth.