Temperatures in parts of the far north are rising at a rate of one degree Celsius per decade; experts believe that the Arctic ice cover could disappear as a year-round feature by the end of the next century. Julian O'Halloran reports from Alaska on the changes affecting the region and hears from the native Inuit - whose hunting season has already been halved by the retreat of the ice - and from climate scientists who tell how global warming could result in extreme, destructive weather conditions worldwide.