Reuters: An ice bridge holding a vast Antarctic ice shelf in place has shattered and may herald a wider collapse caused by global warming, a leading scientist said on Saturday. "It’s amazing how the ice has ruptured. Two days ago it was intact," David Vaughan, a glaciologist with the British Antarctic Survey, told Reuters of a satellite image of the Wilkins Ice Shelf. "We’ve waited a long time to see this." The satellite picture, by the European Space Agency (ESA), showed that a 40-km …