If global warming melts the West Antarctic ice sheet, the thick slab of ice that covers an area the size of Texas, the situation for coastal dwellers around the world may not be as dire as previously estimated. A new study, which has sparked some debate, suggests that the water released by West Antarctica's melting glaciers would raise sea levels by about 10 feet, not the 15 to 20 feet that had previously been predicted. While the results sound like good news, Antarctic experts