A new island has been discovered in the Arctic after rising temperatures melted the giant ice sheet which covered it. The rocky mass - dubbed Warming Island - lies 400 miles north of the Arctic Circle in eastern Greenland, reports The Sun. It was found by US explorer Dennis Schmitt 60 and is seen as further proof of global warming. Danish mapping expert Hans Jepsen said: "It was clearly detached from the mainland when the connecting glacier-bridge retreated southward." Explorer Schmitt said: "There is a dark side to this. We were all aware of the dire consequences."