West Antarctic warming TWICE as fast as previously thought: Study raises the alarm over rise in sea levels

West Antarctic warming TWICE as fast as previously thought: Study raises new alarm over rise in sea levelsAverage temperatures have risen 2.4C since the Fifties, study showsWest Antarctic ice sheet contains enough water to raise sea by 3.3m Sea levels have risen by about 20cm (8in) over the past century By Damien Gayle PUBLISHED: 10:13 GMT, 24 December 2012 | UPDATED: 10:13 GMT, 24 December 2012 West Antarctica is warming almost twice as fast as previously believed, a new study shows, heightening fears of a catastrophic thaw that raise water levels from San Francisco to Shanghai.