redOrbit: A large ice shelf is near collapse in Antarctica, held together only by a small strip of ice as global warming continues to alter the map of the frozen continent. “We’ve come to the Wilkins Ice Shelf to see its final death throes,” glaciologist David Vaughan of the British Antarctic Survey (BAS) told Reuters after his red Twin Otter plane landed near the shelf’s narrowest section. “It really could go at any minute,” he said, adding that the ice bridge could linger weeks or …