Cosmos: Rapid melting of Greenland’s ice sheet this century, once considered unlikely, is now a real possibility. If proved right, many of the world’s coastlines could soon be inundated by rising seas, a new study suggests. The Intergovernmental Panel on Climate Change (IPCC), a global panel of more than 2,000 leading climate scientists, estimate that sea levels may rise up to half a metre over the next century. They attribute 70 per cent of this rise to global warming. Double …