Ice caps melting....really?

It's not just that there will be more water from the melted ice, the space that water occupies is smaler when water is colder. Melting ice means water warms up, so the principle of thermal expansion tells us that water level will continue to rise even if the polar ice does not melt (nobody is predicting they will completely melt as a result of AGW) because the oceans are warming and warmer water takes up more space. Add to this the danger of water from melting glaciers, which will also contribute to more water in the oceans. This is a real threat from AGW, glaciers have been melting for decades.