Sydney Morning Herald: A RAPID collapse of the ice sheet in West Antarctica would raise sea levels by an average of about three metres, half as much as previously thought, a study shows. The effect, however, would still be catastrophic, with a rise of just one metre causing devastation in coastal areas around the globe, scientists said. The West Antarctic ice sheet is considered the most unstable ice sheet in a warming world because much of the bedrock it sits on is below sea level. Loss of …