The history of a changing climate has been officially re-written following the release of new data from Russia and bases within the Arctic Circle. Scientists have now calculated that 2010 has overtaken 1998 to now be the warmest year on record, followed in second place by 2005 as 1998 is pushed into third place. The recalculation of the annual global mean temperature records follows the release of weather data from more than 600 locations around the Arctic Circle.