CBC: Polar ice researchers who teamed up with Canadian Rangers on a patrol around Ellesmere Island this month say they’ve found that cracks in ice shelves are worse than they originally thought. The High Arctic ice shelves could all be fragmented in a matter of years, said Derek Mueller, a polar scientist and research fellow at Trent University, who returned this week from the two-week joint sovereignty patrol and research expedition known as Operation Nunalivut. Mueller said he and …