ScienceDaily: University of Toronto and Oregon State University geophysicists have shown that should the West Antarctic Ice Sheet collapse and melt in a warming world — as many scientists are concerned it will — it is the coastlines of North America and of nations in the southern Indian Ocean that will face the greatest threats from rising sea levels. The catastrophic increase in sea level, already projected to average between 16 and 17 feet around the world, would be almost 21 feet in such …