The melting of the glaciers is a fact which has been documented by lots of folks all over the world.
However, the estimated amount of water contained in all the ice coats of the planet, if melted, is only expected to raise the ocean surface level about twenty feet. This is not so good if you live along the East Coast of the USA, or most of the Sothern USA. Can you say good bye Philadelphia, PA and Huntsville, AL?
The reason the water level would only rise two hundred feet is that most of the world is already covered by deep water. So there is a great deal of surface area, about 2/3 to 3/4 of the planet's total surface, to spread all that water over. Kind of like, the water is deep in the bucket you're using to clean the floor, but the water's not very deep if you spill the bucket on the floor.
Now what that will do to population concentrations, of people and animals, is really speculation right now. Some won't move and will drown, some will use it as an excuse to get up and really travel. But most will probably just move a little farther inland, and push up the realestate prices on the homes that aren't going to get flooded, and might even end up with really great ocean front property and great, long boat ramps which used to be streets and highways. The effects on weather, rain distribution especially, and other things is still to be learned. It the American Midwest doesn't get enough rain there is going to be worldwide starvation on a scale only thought about today. If they get enough rain, shipping to the rest of the world should get easier, because the lower hundred plus miles of the Mississippi River will be so deep that the big ocean going ships will be able jus to sail right over the top of most of New Orleans. Of course that might happen tomorrow with Ivan coming ashore.
Do keep in mind that evidence exists that there have been at least six ice ages followed by almost disappearing polar ice caps over the history of the planet. Whether the current melting of the glaciers is due to man's pouring of carbon dioxide into the atmosphere, or not, is still not really settled despite all the computer models that say it is. We really don't have that much data of how much CO2 was in the atmosphere before the industrial revolution.
However, we really should get cracking on developing alternative energy sources because we're going to run out of oil one of these days.
Kelly