This ties in closely with the wider climate change problem, many people are simply not prepared for what the future is going to bring. As the ice caps melt, sea levels will rise - not just because of the water being released but because water expands as it heats up. The jet streams will also be drastically changed, which keep a relatively stable climate in most areas, looking at the Atlantic ocean for example: air is warmed in the gulf of Mexico, it then travels up towards Europe and finally cools back down as it reaches the Arctic, it travels in a somewhat circular motion. Storms will get a lot more violent as we're already seeing, droughts will hit in unexpected places and generally the weather will get more extreme - massively damaging to humanity wherever it is.