I made this poster in response to the news today and I am not 100% happy with the wording. If the oceans do rise, it will be so slow as to be laughable. It is like being worried that the mountains are rising due to normal tectonic movements. It is much slower than the normal forces that cause people to migrate. Cities and populations move all the time and at much faster rates due to economics and politics. If people are forced to move, it will be because a factory closed, or another neighborhood becomes more fashionable, or (God forbid) a war makes a population flee.