Island nations at the climate talks in Copenhagen have raised concerns about rising sea levels caused by melting ice sheets and glaciers.<br /><br />Peter Hadow, an Arctic explorer, has just got back from a three-month scientific expedition in the area, says the islands are right to be worried.<br /><br />Hadow says the Arctic is likely to lose all its summer time ice cover in just 20 years - if global temperatures continue to rise.
