Thanks to global warming the ice caps in the Arctic and Antarctic regions have been melting faster than ever before.  This is affecting the level of water present in the oceans.  Also the white surface of snow reflects the sunlight back to space, this helps keep earth cooler. While the dark ocean water surface absorbs more heat, making the Earth a warmer planet.

This in turn makes the ice melt faster. So you have low lying landmasses getting submerged. Countries like Bangladesh which are barely a few feet above sea level will see a sharp reduction in the area of land available to them. Sure you can build dams like the Dutch, but how long will the sea stay back? Is the sea going to rise and swallow us all up? No its not that bad, as yet.

Although it would be a good idea to learn how to swim. The water in the polar ice caps is going to be released slowly into the sea and one day we will not have snow any more. The Earth will be a hot and humid place and many of us may be living in boats and floating  to work in cannoes. Till that happens it may be a good idea to get comfortable with water.  Build your own miniature submarine and enjoy the dangers of the deep!