re: Melting arctic means opportunity... and possible conflict

I think simple math fails on such a large scale of the earth. A drop in a puddle is a tsunami in the sea. What happens to the earth underneath as the ice melts? does it rise forcing the water higher? Does the earth under the ocean sink just a bit in reaction to the additional water depth? And what about everything else???? Does it force earthquakes and volcanoes to explode? How does it affect the earths rotation? Do days get longer as more mass is concentrated at the center axis?