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A woman walks past Greenpeace environmental activists dressed up as a polar bear in Prague October 13, 2014. The event is part of a campaign to raise awareness about the threats to the Arctic and to advocate a ban on drilling for oil.

David W Cerny/Reuters

A woman walks past Greenpeace environmental activists dressed up as a polar bear in Prague. The event is part of a campaign to raise awareness about the threats to the Arctic and to advocate a ban on drilling for oil

A student dressed as a bear waits backstage while participating in a cultural event at a school in Mumbai...A student dressed as a bear waits backstage while participating in a cultural event at a school in Mumbai January 30, 2014. REUTERS/Danish Siddiqui

Danish Siddiqui/Reuters

A student dressed as a bear waits backstage while participating in a cultural event at a school in Mumbai, India

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. 

Schoolchildren watch as "Inuka",

Roslan Rahman/Getty Images

Schoolchildren watch as “Inuka”, a male polar bear, swims in its enclosure at the Singapore Zoo on Wednesday. The 22-year-old polar bear, the first one born in the tropics, moved into his new frozen tundra home on May 29 in a 2,700 sq m exhibit featuring climate controlled resting areas and an expanded pool