That would work for what, 20-30 years max before climate change really gets out of hand and violent storms in coastal areas become the norm and the seas start to rise uncontrollably - leading to the single large movement of humanity (making the Syrian emigration look small) and the inevitable political, economic and social chaos that would create. Probably ending up in a war for arable land and resources. What economy will we have then? What future for your children and grandchildren will that be?