polar

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

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