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

Steven Kazlowski / Polar bear (Ursus maritimus) on sea ice, off the coast of Svalbard, Norway

David Tipling / Emperor Penguin (Aptenodytes forsteri) walking across the sea ice of Weddell Sea, near Snow Hill Island, Antarctica, November

David Tipling / Kapitan Klebnikov, an ice breaker, growing through ice in the Weddell Sea near Snow Hill Island, Antarctica, November 2006

David Tipling / Emperor Penguins on sea ice with Kaptan Klebnikov ice breaker in background, Snow Hill Island, Antarctica, November

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

Hiroya Minakuchi / Sea ice, Weddell Sea, Antarctic Peninsula, Antarctica

Martha Holmes / Edge of large piece of ice sheet drifting in sea. Antarctic Peninsula. February 2008.

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

Chadden Hunter / Brinicles (brine icicles or ice stalactites) forming under the ice, growing towards the sea floor, Ross Sea, McMurdo Sound, Antarctica. Taken on location for 'Winter' episode of the BBC Frozen Planet...

Erlend Haarberg / Glacier ice on sea shore, Jokulsarlon, Iceland, April 2010

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

Mark Carwardine / Three Gentoo Penguins (Pygoscelis papua) standing at the edge of sea ice. Antarctic Peninsula, January. Book plate from Mark Carwardine's Ultimate Wildlife Experiences.

Brent Stephenson / Calm conditions with sea ice in the Lemaire Channel. Antarctic Peninsula, Antarctica, December.

Brent Stephenson / Huge iceberg with streaked sky under expansive open sky. Drake Passage, near the South Shetland Islands, Antarctica, December.

Brent Stephenson / Large growler berg in the Lemaire Channel. Antarctic Peninsula, Antarctica, January.

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

Chadden Hunter / King penguins (Aptenodytes patagonicus) walk along beach, South Georgia. Taken on location for BBC Frozen Planet series, 2008

Chadden Hunter / Emperor penguins (Aptenodytes forsteri) explode out of the water, returning to breed at Cape Washington, Antarctica. Taken on location for BBC Frozen Planet series, 2009

Chadden Hunter / Filming on the Antarctic sea-ice at the edge of a small hole. A cameraman gets a shock when a Killer whale (Orcinus orca) mother and calf explode out of the water in front of his face. Taken on locat...

Chadden Hunter / Emperor penguins (Aptenodytes forsteri) males dive through openings in the sea ice to take their first swim in over 4 months as they have spent the bleak winter incubating their eggs. Cape Washington,...

Doug Allan / Killer Whales (Orcinus orca) spy-hopping to observe Weddell Seal (Leptonychotes weddellii) in preparation to knock it from the ice by creating a wave. Marguerite Bay, Antarctic Peninsula, summer. Free...

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 / 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

Jenny E. Ross / Polar Bear (Ursus maritimus) sub-adult male on cliff searching for eggs in Brunnich's Guillemot nests, as gulls look on from above. This unusual behaviour happens when when lack of sea-ice prevents t...

Doug Allan / Snow drift over winter sea ice. Signy Island, South Orkney Islands, Antarctica, August 1980. Freeze Frame book plate page 13.

Kathryn Jeffs / Cliff at edge of tabular iceberg, Antarctica, February 2009, Taken on location for BBC Frozen Planet series

Kathryn Jeffs / Camera lens view of the 'Golden Fleece' in the centre of a horseshoe shaped iceberg off the Antarctic Peninsula, Antarctica, February 2009, Taken on location for BBC Frozen Planet series

Kathryn Jeffs / Iceberg off the Antarctic Peninsula, Antarctica, February 2009, Taken on location for BBC Frozen Planet series

Kathryn Jeffs / Sun low in the sky over floe ice near the Antarctic peninsula, Antactica, January 2009, Taken on location for BBC Frozen Planet series

Kathryn Jeffs / 'Golden Fleece' (base ship of the BBC film crew) as it passes through floe ice off the Antarctic Peninsula, Antarctica, January 2009, Taken on location for BBC Frozen Planet series

Kathryn Jeffs / Coastal landscape off the Antarctic Peninsula, Antarctica, January 2009, Taken on location for BBC Frozen Planet series

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

Kathryn Jeffs / Southern Type B Killer whales (Orcinus orca) hunting Weddell seal (Leptonychotes weddelli) spyhopping to assess where seal is on ice floe and to intimidate, Antarctica. Taken on location for BBC Froz...

Kathryn Jeffs / Southern Type B Killer whales (Orcinus orca) hunting Weddell seal (Leptonychotes weddelli) using coordinated wave washing technique, Antarctica. Taken on location for BBC Frozen Planet series, Januar...

Kathryn Jeffs / Southern Type B Killer whale (Orcinus orca) hunting Weddell seal (Leptonychotes weddelli) spyhopping to assess where seal is on ice, whilst Humpback whale (Megaptera novaeangliae) surfaces nearby, Ant...

Kathryn Jeffs / Southern Type B Killer whale (Orcinus orca) hunting Weddell seal (Leptonychotes weddelli), Antarctica. Taken on location for BBC Frozen Planet series, January

Kathryn Jeffs / Southern Type B Killer whales (Orcinus orca) hunting Weddell seal (Leptonychotes weddelli) using coordinated wave washing technique, Antarctica. Taken on location for BBC Frozen Planet series, Januar...

Kathryn Jeffs / Southern Type B Killer whale (Orcinus orca) spyhops to see if Crabeater seals (Lobodon carcinophagus) are potential prey, Antarctica. Taken on location for BBC Frozen Planet series, January 2009

Kathryn Jeffs / Filming Southern Type B Killer whales (Orcinus orca) in Antarctica. Taken on location for BBC Frozen Planet series, January 2009

Kathryn Jeffs / Adelie penguins (Pygoscelis adeliae) on ice floe, Antarctica. Taken on location for BBC Frozen Planet series, January 2009

Frederique Olivier / Aerial view of caved icebergs holding pack ice, Antarctica, March 2011.

Frederique Olivier / Young Emperor penguins (Aptenodytes forsteri) jumping off ice floes, Antarctica, February 2011.

Jeff Wilson / Royal Navy ship, HMS Endurance, crashing through the waves in the south atlantic ocean, Antarctica, November 2009. Taken on location for the BBC series, Frozen Planet.

Jeff Wilson / Pyramid of sea ice catching the first rays of the returning sun in the high Arctic, Svalbard, Spitsbergen, Norway, February 2009. Taken on location for the BBC series, Frozen Planet.

Jeff Wilson / Silhouette of Arctic wolf (Canis lupus) on sea ice, Ellesmere Island, Nunavut, Canada, June 2008. Taken on location for BBC series, Frozen Planet, Summer

Jeff Wilson / Pyramid of sea ice catching the first rays of the returning sun in the high Arctic, Svalbard, Spitsbergen, Norway, February 2009. Taken on location for the BBC series, Frozen Planet.

Jeff Wilson / Royal Navy helicopter from HMS Endurance flying over sea and antarctic landscape, November 2008, Taken on location for the BBC series, Frozen Planet.

Jeff Wilson / Pyramid of sea ice catching the first rays of the returning sun in the high Arctic, Svalbard, Spitsbergen, Norway, February 2009. Taken on location for the BBC series, Frozen Planet.

Jeff Wilson / View through the porthole of science teams and Frozen Planet film crew working on the sea ice in the Bering Sea, Alaska, USA, March 2008. The film crew were in search of Spectacled eider ducks, temper...

Jeff Wilson / Crew member of the US coastguard ship 'Healy' standing on the sea ice in front of the ship's hull after the ship became stuck in the ice, Bering Sea, Alaska, USA, March 2008. Taken on location for the...

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.

Bryan and Cherry Alexander / Inuit hunter travelling by dog sled during the polar night. Northwest Greenland, 1987. 40 BELOW bookplate.

Bryan and Cherry Alexander / Dramatic 'Undulatus asperatus' cloud formation as a storm builds at dawn over Qaanaaq, Inglefield Bay. Northwest Greenland, September 2008. This cloud formation was first proposed as a new type of clo...

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

Bryan and Cherry Alexander / Melting iceberg showing the portion underwater that is sculpted by the sea. Polar regions. Digitally created image composite

Bryan and Cherry Alexander / Tabular iceberg showing the portion underwater that is sculpted by the sea. Polar regions. Digitally created image composite

Bryan and Cherry Alexander / Ice arch iceberg showing the portion underwater that is sculpted by the sea. Polar regions. Digitally created image composite

Bryan and Cherry Alexander / Iceberg and grease ice reflecting in the Weddell Sea at sunset. Antarctica, October 2006.

Bryan and Cherry Alexander / Icebergs in the Weddell Sea at sunset. Antarctica, October 2006.

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

Troels Jacobsen/Arcticphoto / Adelie Penguins (Pygoscelis adeliae) diving into the water, on their way out to sea to feed. Brown Bluff. Antarctic Peninsula.

Bryan and Cherry Alexander / Line of Emperor penguins (Aptenodytes forsteri) walking on sea ice. Flutter Rookery, East Antarctica.

Jenny E. Ross / Harp seal pup (Phoca groenlandicus) with white coat on the sea ice. Gulf of St. Lawrence, Nova Scotia, Canada. March

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

Bryan and Cherry Alexander / Tourists on icebreaker "Professor Multanovskiy" watching Polar bear (Ursus maritimus) in pack ice. Svalbard, Norway, 2004.

Bryan and Cherry Alexander / Chukchi men resting their Huskies (Canis familiaris) during hunting trip. Chukotskiy Peninsula, Chukotka, Siberia, Russia.

Bryan and Cherry Alexander / Chukchi hunters travelling with Huskies (Canis familiaris) near Cape Dezhnev. Chukotskiy Peninsula, Chukotka, Siberia, Russia.

Bryan and Cherry Alexander / Chukchi hunter scanning sea ice for Polar bears from his vantage point on top of pressure ice. Chukotka, Siberia, Russia.

Bryan and Cherry Alexander / Icebergs frozen in frazil ice (ice crystals) at beginning of winter. Northwest Greenland, 1991.

Bryan and Cherry Alexander / Inuit hunters watching Huskies (Canis familiaris) making their way to shore across new tidal ice. Savissivik, Northwest Greenland, 1991.

Bryan and Cherry Alexander / Inuit hunter rescuing Huskies (Canis familiaris) that have fallen through thin sea ice. Savissivik. Northwest Greenland, 1991.

Bryan and Cherry Alexander / Inuit hunter untangling team of Huskies (Canis familiaris) in front of iceberg. Savissivik, Northwest Greenland, 1997.

Bryan and Cherry Alexander / Inuit hunter and Huskies (Canis familiaris) walking through village in Autumn. Savissivik, Northwest Greenland, 1991.

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

Eric Baccega / View from deck of a cruise ship cruising along Baffin Island with an iceberg emerging out ot the mist, Nunavut, Canada, August 2010