Xinhua: An ice shelf that is wrenching itself away from Antarctica is a symptom of global warming and will have further environmental consequences, according to a New Zealand scientist. A satellite picture showed that a 40-km-long strip of ice believed to pin the Wilkins Ice Shelf in place has snapped at its narrowest point, off the Antarctic Peninsula. Professor Tim Naish from the Antarctic Research Center at Victoria University in Wellington said it was the ice sheets behind …