David Woodfall / Male Polar Bear (Ursus maritimus) in sub-arctic with Tundra Buggy in the background, Wapusk NP, Hudson Bay, Manitoba, Canada, December 2004

David Woodfall / Sub arctic landscape with ice and frozen sea, Wapusk National Park, Hudson Bay, Manitoba, Canada, December 2004

Bryan and Cherry Alexander / Polar bear (Ursus maritimus) skin stretched on a drying frame outside an Inuit home in Iqaluit, Nunavut, Canada, April 2008.

Bryan and Cherry Alexander / Washed away Ward Hunt Ice shelf around Ward Hunt Island. Ellesmere Island, Nunavut, Canada, 1994.

Bryan and Cherry Alexander / Washed away Ward Hunt ice shelf around Ward Hunt Island. Ellesmere Island, Nunavut, Canada, 1994.

Bryan and Cherry Alexander / Inuit man retrieving American lake trout (Salvelinus namaycush) from his net set under the ice at Baker Lake. Nunavut, Canada, 1982.

Bryan and Cherry Alexander / Inuit hunter from Arctic Bay filling a kettle with snow to make tea. Baffin Island, Nunavut, Canada, 2005.

Tom Vezo / Arctic skua / Jaegar (Stercorarius parasiticus) on nest beside water, Canada

Steven Kazlowski / Polar bear (Ursus maritimus) subadult sits up on its hind legs to get a better view of what is approaching, along a barrier island in early autumn, off Barter Island and the Arctic National Wildlife R...

Steven Kazlowski / Polar bear (Ursus maritimus) adult scents the air as it sits next to a Bowhead whale {Balaena mysticetus} bone, off Barter Island and the 1002 area of the Arctic National Wildlife Refuge, Alaska

Steven Kazlowski / Polar bear (Ursus maritimus) female with cubs swimming towards the coast, Beaufort Sea, off the Arctic National Wildlife Refuge, Alaska

Steven Kazlowski / Polar bear (Ursus maritimus) female resting along a barrier island in early autumn, off Barter Island and the Arctic National Wildlife Refuge, Alaska