Norway

Northern lights (Aurora borelias) are seen over the city of Tromso in northern Norway.

Jan Morten/scanpix/AFP

Northern lights (Aurora borelias) over the city of Tromso in northern Norway.

Marine reservists James Mullard (right) from Rosyth Scotland and Ed Dutton (left) from Plymouth taking a rest during a ski patrol in the hills of Harstad, Northern Norway, in the Arctic Circle as part of their Cold Weather Survival training which lasts for two weeks. PRESS ASSOCIATION Photo. Picture date: Monday March 17, 2014.

David Cheskin/PA

Marine reservists James Mullard, right, from Rosyth, Scotland, and Ed Dutton, left, from Plymouth, take a rest during a ski patrol in the hills of Harstad, northern Norway, in the Arctic Circle as part of their Cold Weather Survival training which lasts for two weeks

A sign warns residents of the arctic Svalbard islands in Norway of the danger from roaming polar bears, May 26, 2013. Svalbard in Norway's high Arctic, is home to 2,500 people and about 3,000 polar bears. Picture taken May 26, 2013. To match NORWAY-ARCTIC/NYAALESUND.

Balazs Koranyi/Reuters

A sign warns residents of the arctic Svalbard islands in Norway of the danger from roaming polar bears. Svalbard is Norway’s high Arctic, is home to 2,500 people and about 3,000 polar bears. Read more