I've heard this before and I've seen it from some pretty reliable sources...but looking at a globe I find it difficult to fathom how the relative size of polar caps can raise the entire ocean level of the globe 25 meters (wikipedia says if it were all to melt, it would be 60 meters). How is this possible? The artic ice cap has already shrunk by over 20% since the 70's. Is everyone counting the ice below the surface too?