Paris (AFP) - A rapidly melting glacier atop East Antarctica is on track to lift oceans at least two metres, and could soon pass a "tipping point" of no return, researchers said Wednesday. To date, scientists have mostly worried about the Greenland and West Antarctic ice sheets as dangerous drivers of sea level rise. But the new study, following up on earlier work by the same team, has identified a third major threat to hundreds of millions of people living in coastal areas around the world. "I predict that before the end of the century the great global cities of...