Sea levels could rise up to 5 feet by the end of this century, driven by warming in the Arctic and the resulting melt of snow and ice, according to this study by the International Arctic Monitoring and Assessment Program (AMAP). This is more than two and a half times higher than the 2007 projection of a half to two feet by the Intergovernmental Panel on Climate Change. The largest and most permanent bodies of ice in the Arctic – multiyear sea ice, mountain glaciers, ice caps and the Greenland Ice Sheet – have all been declining faster since 2000 than they did in the previous decade. The Arctic Ocean is projected to become nearly ice-free in summer within this century, likely within the next thirty to forty years. The Arctic temperature increase and the decline of snow and ice feed upon themselves, in an accelerating feedback loop that is causing more rapid melting and sea level rise. The reflective Arctic ice and snow act as a protective shield, sending solar radiation into space. As the ice and snow disappears it is replaced by darker seawater or land, which absorbs more of the incoming radiation. This absorbed energy is released as heat during the summer months, further adding to Arctic warming, which in turn accelerates melting. For full text: