AFP: THE largest ice island in almost 50 years poses no immediate threat as it will take up to two years to drift through the Arctic Ocean, the Canadian who discovered it said. Trudy Wohlleben, a forecaster from the Canadian Ice Service, spotted the massive slab of ice that broke off a glacier in northern Greenland last week as she analysed raw data from a NASA satellite. At about 30km long and 10km wide, the ice island is about four times the size of Manhattan and experts say the …