Antarctic ice really is collapsing, oceans' rise unstoppable

Two groups of scientists report that large parts of the ice sheet in West Antarctica have started to collapse. Global warming is accelerating the pace, they said at a NASA press conference today. They believe the rise of sea levels is unstoppable. NASA's Thomas P. Wagner: "This is really happening. There’s nothing to stop it now. But you are still limited by the physics of how fast the ice can flow.”