Formations older than 1 year see heavy declines
                                
                                
                                    (Newser) -
                                    The Arctic's oldest, thickest ice is melting and may undermine the entire Arctic ice cap, NASA satellite photos show. Some 965,300 square miles of perennial ice, more than a year old, has melted over the past year—a 50% decrease. Losses of older, hardier frost are even greater: Three...