Ships will be able to sail in open water to the North Pole in the summer of 2020, according to a study that found a rapid acceleration in the loss of sea ice. Quelle: http://feeds.timesonline.co.uk/c/32313/f/440134/s/69ed872/l/0L0Stimesonline0O0Ctol0Cnews0Cscience0Cearth0Eenvironment0Carticle6875260A0Bece0Tcid0FOTC0ERSS0Gattr0F20A15164/story01.htm