Amos, Jonathan (12 december 2007). ”Arctic summers ice-free 'by 2013'”. BBC News. http://news.bbc.co.uk/2/hi/science/nature/7139797.stm. Läst 16 december 2007.: "Scientists in the US have presented....modelling studies indicat[ing] northern polar waters could be ice-free in summers within just 5-6 years....[O]ther teams have variously produced dates for an open summer ocean that, broadly speaking, go out from about 2040 to 2100."
arctic: "late 14c., artik, from O.Fr. artique, from M.L. articus, from L. arcticus, from Gk. arktikos "of the north," lit. "of the (constellation) Bear," from arktos "bear," the Bear being a northerly constellation" http://dictionary.reference.com/etymology/arctic 2010-08-22
Online-Informationen des Umweltbundesamtes: umweltbundesamt.de › Themen› Wasser› Arktis› Menschen in der Arktis › Wirtschaftszweige, datum 22 september 2015, läst 9 januari 2022
