Don't panic. The land down under hasn't gone under. These are simply images created by a U.S. geographer speculating what Australia would look like if the oceans rose 100-500 meters. But no amount of global warming will sink the continent anytime soon. During the last ice age, sea levels were about 100 meters lower than today, so these estimates are extreme to say the least. The Intergovernmental Panel on Climate Change presents rising sea level projections in terms of centimeters, not meters. So no need to make a run on Foster's, people.