Australian: AN Antarctic ice bridge has snapped, threatening to trigger the collapse of an ice shelf a quarter the size of Tasmania. If the Wilkins ice shelf disintegrates, as scientists fear, it will be the largest slab of ice lost from Antarctica in recent times. Speaking of the falling bridge, Tas Van Ommen, a glaciologist with the Australian Antarctic Division in Hobart, said: “It was just sitting there waiting to happen ever since we lost a 400sqkm chunk last March.” He said …