Andy Rouse / Polar Bear (Ursus maritimus) portrait in sea-ice landscape. Wide angle / fish-eye shot. Svalbard, Norway, September.

Danny Green / Polar bear (Ursus maritimus) and cubs, standing on sea ice. Svalbard, Norway, July.

Danny Green / Polar bear (Ursus maritimus) and cubs resting on sea ice. Svalbard, Norway, July.

Danny Green / Polar bear (Ursus maritimus) female and cubs, one cub walking up slope of ice in foreground. Svalbard, Norway, July.

Danny Green / Ringed seal (Pusa hispida) resting on ice, reflected in water. Svalbard, Norway. July.

Tony Heald / Glaucous Gull (Larus hyperboreus) taking off from ice, Svalbard Norway, July.

Sven Zacek / Bearded seal (Erignathus barbatus) sunbathing on iceberg broken off from glacier. Kongsfjorden fjord, Spitsbergen, Norway. June 2014.

Danny Green / Sea otter (Enhydra lutris) resting on sea ice, Alaska, USA, June

Danny Green / Sea otter (Enhydra lutris) resting amongst sea ice, Alaska, USA, June

Danny Green / Sea otters (Enhydra lutris) resting on ice, Alaska, USA, June

Danny Green / Three Sea otters (Enhydra lutris) resting on ice, Alaska, June

Pal Hermansen / Barnacle geese (Branta leucopsis) with goslings, Jokulsarlon ice field, Iceland, June.

Pal Hermansen / One-year ice off Ellesmere island, Nunavut, Canada, August.

Brent Stephenson / Sunset off Scott Island, with floating pieces of sea ice, Scott Inlet, Baffin Island, Canadian Arctic, August 2015.

Brent Stephenson / Young Polar bear (Ursus maritimus) walking across melting sea ice, Scott Inlet, Baffin Island, Canadian Arctic, August. Vulnerable species.

Sven Zacek / View through glacier ice towards snow-covered mountains in Kongsfjorden fjord in Svalbard, Norway. June 2015.

Ross Hoddinott / Ice on black volcanic sand beach with waves, Jokulsarlon, Southeast Iceland, February.

Ole Jorgen Liodden / Ice cliff of the Austfonna ice cap with melt water and ice crashing down to the sea, Svalbard, Norway, July 2012.

Ole Jorgen Liodden / Polar bear (Ursus maritimus) walking across vast ice floe, Spitsbergen, Svalbard, July 2013.

Christophe Courteau / Iceberg, Spitzbergen, Norway, June, 2012.

Orsolya Haarberg / Arctic tern (Sterna paradisaea), adult feeding young. Jokulsarlon glacial lagoon. Iceland. August 2008

Steven Kazlowski,Steven Kazlowski / Polar bear (Ursus maritimus) juvenile spreading body weight over thin newly forming pack ice, trying not to break through, Beaufort Sea, off the 1002 area of the Arctic National Wildlife Refuge, North...

Steven Kazlowski,Steven Kazlowski / Polar bear (Ursus maritimus) juvenile rolling around on newly formed pack ice, Beaufort Sea, off the 1002 area of the Arctic National Wildlife Refuge, North Slope, Alaska

Steven Kazlowski,Steven Kazlowski / Polar bear (Ursus maritimus) curious adult head underwater, Beaufort Sea, off the 1002 area of the Arctic National Wildlife Refuge, North Slope, Alaska.

Steven Kazlowski,Steven Kazlowski / Polar bear (Ursus maritimus) young bear in freezing water during autumn freeze up, Bernard Spit, 1002 area of the Arctic National Wildlife Refuge, North Slope, Alaska, Beaufort Sea

Steven Kazlowski,Steven Kazlowski / Polar bear (Ursus maritimus) 4-5 year-old on pack ice, low angle shot, off the 1002 area of the Arctic National Wildlife Refuge, North Slope of the Brooks Range, Alaska, Beaufort Sea, autumn

Wild Wonders of Europe / O. Haarberg / Glacier ice on the sea shore, rfi / Oraefi, Iceland, June 2008. WWE INDOOR EXHIBITION

Danny Green / Fulmer (Fulmras glacialis) in flight near blue glacier, Svalbard, July. Bookplate from Danny Green's 'The Long Journey North'

Florian Möllers / Blue iceberg drifting off Brasvellbreen glacier, Austfonna, Nordaustlandet, Svalbard, Norway, July 2012

Staffan Widstrand / Brunnich's Guillemot (Uria lomvia) stretching wings and calling on small ice floe, Svalbard, Norway, July

Staffan Widstrand / Coastal ice, Svalbard, Norway, July 2011

Peter Cairns / Reflections in glacial fjord, Kongsfjorden, Svalbard, Norway

Eric Baccega / Young Inuit boy jumping over a crack on ice floe, Ellesmere Island, Nanavut, Canada, June 2012. Model released.

Konrad Wothe / Iceberg in Endicott Arm, Inside Passage, Southeast Alaska, USA, July 2006

Roy Mangersnes / Black-legged kittiwakes (Rissa tridactyla) in flight during evening snowfall, Northern Nordaustlandet, Svalbard, Norway, August

Roy Mangersnes / Juvenile Black-legged kittiwake (Rissa tridactyla) flying over Raudfjorden, North-western tip of Spitsbergen, Svalbard, Norway, September

Todd Mintz / Narwhal (Monodon monoceros) pod at surface with one tusk visible, Arctic Bay, Baffin Island, Canada, June

Todd Mintz / Iceberg dive, diver next to ice floe, Pond Inlet, Baffin Island, Nunavut, Canada, June

Eric Baccega / Portrait of Harp seal (Phoca groenlandicus) pup, Magdalen Islands, Gulf of St Lawrence, Quebec, Canada, March 2012

Eric Baccega / Tourist watching Harp seal (Phoca groenlandicus) pup on sea ice, Magdalen Islands, Gulf of St Lawrence, Quebec, Canada, March 2012. Model released.

Eric Baccega / Female Harp seal (Phoca groenlandicus) surfacing at a breathing hole in the sea ice, Magdalen Islands, Gulf of St Lawrence, Quebec, Canada, March 2012

Eric Baccega / Portrait of Harp seal (Phoca groenlandicus) pup on sea ice, Magdalen Islands, Gulf of St Lawrence, Quebec, Canada, March 2012

Eric Baccega / Portrait of Harp seal (Phoca groenlandicus) pup, Magdalen Islands, Gulf of St Lawrence, Quebec, Canada, March 2012

Andy Rouse / Polar ice cap at sunset. Austfonna Polar Ice Cap, Svalbard, Norway, August 2011.

Ole Jorgen Liodden / Polar Bear (Ursus maritimus) sitting on floe in vast thawing sea-ice landscape. Spitsbergen, Svalbard, August 2011. Second place, Mammals Category, GDT 2012 competion. Winner in ANIMALS IN THEIR ENVIR...

Ole Jorgen Liodden / Black-legged Kittiwake (Rissa tridactyla) in blue ice. Spitsbergen, Svalbard, July.

Ole Jorgen Liodden / Glaucous Gull (Larus hyperboreus) on blue ice. Spitsbergen, Svalbard, July.

Ole Jorgen Liodden / Iceberg in calm arctic seas at 80 degrees north. Svalbard, September.

Ole Jorgen Liodden / Polar Bear (Ursus maritimus) looking across ice floe seascape. Nordaustlandet, Svalbard, August.

Christophe Courteau / Panoramic landscape of Kings Karls Forland Island, National Park, Spitzbergen, Svalbard, Norway, July 2011. Digital Blend of images

Steven Kazlowski / Polar bear (Ursus maritimus) curious cub sits up on its hind legs and tries to balance itself, along Bernard Spit in autumn, 1002 area of the Arctic National Wildlife Refuge, Alaska, USA, October

Steven Kazlowski / Polar bear (Ursus maritimus) curious cub sits up on its hind legs, paw raised, and tries to balance itself, along Bernard Spit in autumn, 1002 area of the Arctic National Wildlife Refuge, Alaska, US...

Steven Kazlowski / Polar bear (Ursus maritimus) curious adult investigates a remote camera along a hillside on Spitsbergen and the northwest coast of the Svalbard Archipelago, Norway, Greenland Sea, July

Danny Green / Little Auks (Alle alle) flying low above surface in front of iceberg. Spitsbergen, Svalbard, Norway, July 2010. Highly commended in the Birds category in the GDT competition 2011.

David Woodfall / Aerial view of pancake ice sheet cracking and melting in Hudson Bay, Manitoba, Canada, December 2004

Eric Baccega / Black-legged Kittiwake (Rissa tridactyla) on ice. Floe edge, Arctic Bay, Nunavut, Canada, April.

Eric Baccega / Melting ice at Floe Edge, Arctic Bay, Baffin Island, Nunavut, Canada, April 2009.

Kevin Schafer / Kittiwake (Rissa tridactyla) flock feeding in from of the Monaco Glacier, Leifdefjord, Svalbard, Norway 2010

Kevin Schafer / Fogbow over pack ice, Svalbard, Arctic Norway 2010

Eric Baccega / Icebergs and glacier, Croker Bay, Devon Island, Nunavut, Canada, August 2010

Eric Baccega / View across the bow of the Lyubov Orlova ship, moving through pack ice at dawn, off the coast of Devon Island. Nunavut, Canada, August 2010

Eric Baccega / Icebergs and glacier under clear blue sky, Croker Bay, Devon Island, Nunavut, Canada, August 2010

Eric Baccega / Iceberg in Davis Strait off south Baffin island, Nunavut, Canada, August 2010

Eric Baccega / Icebergs and glacier, Croker Bay, Devon Island, Nunavut, Canada, August 2010

Eric Baccega / Polar bear (Ursus maritimus) female and her two cubs on large iceberg off Baffin Island. Nunavut, Canada, August 2010

Bryan and Cherry Alexander / Melting ice floe floating in front of iceberg off the coast of Ellesmere Island, Nunavut, Canada.

Bryan and Cherry Alexander / Inuit hunter jumping from one ice floe to another. Ellesmere Island, Nunavut, Canada, 1994.

Steven Kazlowski / Atlantic puffin (Fratercula arctica) flying along the coast of Svalbard in summer, Norway

Steven Kazlowski / Polar bear (Ursus maritimus) traveling along the coast on sea ice in search of seals, Svalbard, Norway

Steven Kazlowski / Portrait of polar bear (Ursus maritimus) travelling across melting sea ice in search of seals, Svalbard, Norway

Steven Kazlowski / Glacial landscape in Smeerenburgfjorden, along the northwest coast of Svalbard, Norway, Europe. July 2009

Thomas Lazar / Ice hanging from arch in sea cave carved in soft sandstone cliffs, frozen lake, Squaw Bay, Lake Superior, Apostle Islands National Lakeshore, Wisconsin, USA, February 2009

Steven Kazlowski / Polar bear (Ursus maritimus) sow jumping while hunting for seals on sea ice, off the coast of Svalbard, Norway

Wild Wonders of Europe / de la Lez / Black legged kittiwakes (Rissa tridactyla) in flight over ice, Kungsfjord, Svalbard, Norway, June 2008 Wild Wonders kids book.

Wild Wonders of Europe / Cairns / Pack ice on sea in fog, Svalbard, Norway, August 2009

Wild Wonders of Europe / Cairns / Pack ice and iceberg on sea, Svalbard, Norway, August 2009

Wild Wonders of Europe / Cairns / Pack ice on sea, Svalbard, Norway, August 2009

Nick Garbutt / Sea cliffs, shoreline and pack ice at Hambergbukta, south east Spitsbergen, Svalbard, Arctic Norway, June 2009

Wild Wonders of Europe / Liodden / Brunnich's guillemots (Uria lomvia) on ice, Spitsbergen, Svalbard, June 2009 WWE BOOK Wild Wonders kids book.

Wild Wonders of Europe / Liodden / Two Glaucous gulls (Larus hyperboreus) flying past a glacier, Spitsbergen, Svalbard, March 2009

Andy Rouse / Polar Bear (Ursus maritimus) mother and cub playing in water, Svalbard, Norway, September 2009

Steven Kazlowski / Freshly frozen pack ice off Cape Thompson, 26 miles south of Point Hope, Arctic coast of Alaska, March 2008

Steven Kazlowski / Cape Thompson and an open lead in the pack ice, blown open by strong winds, indicating thinning sea ice conditions, 26 miles south of Point Hope, Arctic coast of Alaska, March 2008

Orsolya Haarberg / Glacier ice laying on black volcanic sand. rfi, Iceland. June 2008

Orsolya Haarberg / Glacier ice laying on black volcanic sand. rfi, Iceland. June 2008

Orsolya Haarberg / Glacier ice laying on black volcanic sand. rfi, Iceland. June 2008

Orsolya Haarberg / Glacier ice laying on the sea shore. rfi, Iceland. June 2008

Orsolya Haarberg / Glacier ice laying on the sea shore. rfi, Iceland. June 2008

Steven Kazlowski / Polar bear (Ursus maritimus) climbing onto an iceberg with Arctic terns {Sterna paradisaea} flying overhead, Beaufort Sea, Arctic Ocean, Alaska

Doug Allan / Aerial view of sea ice melting, creating patterns over spring sea surface, Lancaster sound, Canadian Arctic

Hanne & Jens Eriksen / Polar bear {Ursus maritimus} feeds on seal kill with gulls scavenging, Svalbard, Norway north coast

DOC WHITE / Aerial view of two Beluga / White whale {Delphinapterus leucas} swimming near ede of ice, Canadian arctic

Doug Allan / Doug Allan filming under sea ice in Lancaster Sound, Arctic Canada

Martha Holmes / Polar bear swimming near ice floe. Canada, North West Territories

Juergen Freund / Looking up at silhouette of Diver under ice. Magdalen Islands, Atlantic, Canada

Andy Rouse / Polar bear (Ursus maritimus) standing on pack ice at sunset. Svalbard, Norway.