Guardian: An ice island with an area of 100 square miles has broken off from one of Greenland’s two main glaciers in what scientists say is the biggest such event in the Arctic in nearly 50 years. The huge chunk of ice, which is 600ft thick, broke off the Petermann Glacier, located about 620 miles south of the North Pole, on Thursday. It is now drifting in a remote area called the Nares Strait between Greenland and Canada. Andreas Muenchow, professor of ocean science and …