Heike Odermatt / Walrus (Odobenus rosmarus) climbing on ice floe, Svalbard, Norway

Stefan Christmann / Emperor penguin (Aptenodytes forsteri) group clambering up slope during journey to bring back food for young. Atka Bay, Antarctica. September.

Yva Momatiuk & John Eastcott / Ice climber scaling Skaftafellsjokull Glacier, Skaftafell National Park, Iceland

Yva Momatiuk & John Eastcott / Ice climber scaling Skaftafellsjokull Glacier, Skaftafell National Park, Iceland

Mark Hamblin / 2020VISION / Climbers on ascent of Cairn Lochan in winter, Cairngorms National Park, Highlands, Scotland, UK, January 2011

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...

Andrew Parkinson / Ptarmigan (Lagopus mutus) in white winter plumage framed by a walker passing by during a blizzard. Cairngorm Mountains, Scotland, UK. February (non-ex)

Jeff Wilson / Camera crew searching for crevasse to film in, Gorner glacier, near Zermatt in the Swiss Alps, Switzerland. For BBC Planet Earth series, Mountains episode, 2006

Jeff Wilson / Film crew lowering camera into crevasse in Gorner glacier, near Zermatt in the Swiss Alps, Switzerland, for BBC Planet Earth series, Mountains episode, 2006

Doug Allan / Climbers on summit ridge at 6,000m, Mount Illampu, Bolivia, March 2005. Freeze Frame book plate page 137.

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

Flip Nicklin / Polar Bear (Ursus maritimus) hauling out on ice floe, Wager Bay, Canada

SCOTLAND: The Big Picture / Winter hiker with ice axe climbing Beinn Fhada, Glen Affric, Kintail, Scotland, UK, February.

Stefan Christmann / Emperor penguin (Aptenodytes forsteri) climbing up out of gully in ice. Atka Bay, Antarctica. September.

Stefan Christmann / Emperor penguin (Aptenodytes forsteri) climbing up out of gully in ice. Atka Bay, Antarctica. September.

Stefan Christmann / Emperor penguin (Aptenodytes forsteri) group clambering up slope during journey to bring back food for young. Atka Bay, Antarctica. September.

Ashley Cooper / Mountaineer, Mike Withers ice climbing in Fisher Place gill above Thilrmere, Lake District, UK. This waterfall very rarely comes into climbable condition, but did so in January 2010

Ashley Cooper / Mountaineer, Mike Withers ice climbing in Fisher Place gill above Thilrmere, Lake District, UK. This waterfall very rarely comes into climbable condition, but did in January 2010.

Ashley Cooper / Mountaineer, Mike Withers ice climbing in Fisher Place gill above Thilrmere, Lake District, UK. This waterfall very rarely comes into climbable condition, but did in January 2010.

Ashley Cooper / Climbers on the arete leading up from the Vallee Blanche to the Aiguille Du Midi above Chamonix, France. September 2014

Ashley Cooper / Mont Blanc from the Aiguille Du Midi above Chamonix, France, with climbers on the Cosmiques Arete, climbing the ladder to access the cable car station. September 2014

Ashley Cooper / Mont Blanc with climbers on the Cosmiques Arete, climbing the ladder to access the cable car station. Aiguille Du Midi above Chamonix, France, September 2014

Ashley Cooper / Mont Blanc with climbers on the Cosmiques Arete, climbing the ladder to access the cable car station. Aiguille Du Midi above Chamonix, France, September 2014

Ashley Cooper / Members of the Langdale Ambleside Mountain Rescue Team rescue a man fallen through ice on Rydal Water, Lake District, England, UK.

Ashley Cooper / Climber i on Sgurr Alasdair on the Cuillin Ridge, Isle of Skye, Scotland. March 2006

Ashley Cooper / Mountaineer winter climbing in Coire an Sneachda, Cairngorm mountains, Scotland, UK. February 2011

Ashley Cooper / Mountaineer winter climbing in Coire an Sneachda, Cairngorm mountains, Scotland, UK. February 2011

Ashley Cooper / Mountaineer, Mike Withers ice climbing in Fisher Place gill above Thilrmere, Lake District, UK. This waterfall very rarely comes into climbable condition, but did in January 2010.

Ashley Cooper / Mountaineer, Mike Withers ice climbing in Fisher Place gill above Thilrmere, Lake District, UK. This waterfall very rarely comes into climbable condition, but did in January 2010.

Ashley Cooper / Mountaineer, Mike Withers ice climbing in Fisher Place gill above Thilrmere, Lake District, UK. This waterfall very rarely comes into climbable condition, but did in January 2010.

Ashley Cooper / Mountaineer, Mike Withers ice climbing in Fisher Place gill above Thilrmere, Lake District, UK. This waterfall very rarely comes into climbable condition, but did in January 2010.

Olga Kamenskaya / Polar bear (Ursus maritimus) climbing last remnants of ice in the summer to reach the top of a cliff, Novaya Zemlya, Russian Arctic, July

Yva Momatiuk & John Eastcott / Ice climbers on Skaftafellsjokull Glacier, Skaftafell National Park, Iceland

Frederique Olivier / Emperor penguin (Aptenodytes forsteri) chick struggling to climb out of a tide crack on way to sea, with other chicks standing behind, Adelie Land, Antarctica, January.

Frederique Olivier / Group of Emperor penguin (Aptenodytes forsteri) chicks swimming across a tide crack and climbing out the other side, Adelie Land, Antarctica, January.

Frederique Olivier / Group of Emperor penguin (Aptenodytes forsteri) chicks swimming across a tide crack and climbing out the other side, one struggling, Adelie Land, Antarctica, January.

Frederique Olivier / Group of Emperor penguin (Aptenodytes forsteri) chicks crossing a tide crack and climbing out the other side, one struggling, Adelie Land, Antarctica, January.

Frederique Olivier / Emperor penguin (Aptenodytes forsteri) chick jumps into a tide crack, struggling to get out again, Adelie Land, Antarctica, January.

Frederique Olivier / Emperor penguin (Aptenodytes forsteri) chicks struggling to climb out of a tide crack, Adelie Land, Antarctica, January.

Frederique Olivier / Emperor penguin (Aptenodytes forsteri) chick climbing out of a tide crack, Adelie Land, Antarctica, January.

Frederique Olivier / Emperor penguin (Aptenodytes forsteri) chick climbing out of a tide crack using beak, Adelie Land, Antarctica, January.

Frederique Olivier / Tired Emperor penguin (Aptenodytes forsteri) chick climbing out of a tide crack, Adelie Land, Antarctica, January.

Frederique Olivier / Adelie penguins (Pygoscelis adeliae) climbing out of a tide crack, Adelie Land, Antarctica, January.

Franco Banfi / Climbers on ice wall, Mendenhall Glacier, near Juneau, Alaska, North Pacific Ocean.

Ole Jorgen Liodden / Polar bear (Ursus maritimus) climbing blue ice, Nordaustlandet, Svalbard, Norway, July.

Ole Jorgen Liodden / Polar bear (Ursus maritimus) climbing over blue ice, Nordaustlandet, Svalbard, Norway, July.

Ole Jorgen Liodden / Ice climber on ice cliff, Hallingdal, Norway, March 2005.

Ole Jorgen Liodden / Ice climber on ice cliff, Hallingdal, Norway, March 2005.

Ole Jorgen Liodden / Ice climber on ice cliff, Hallingdal, Norway, March 2005.

Bryan and Cherry Alexander / Female Polar bear (Ursus maritimus) climbing out of the sea onto an ice floe, in summer ice. Svalbard, Norway.

Mark MacEwen / Climber on cliff in Frenchman Coulee, a gorge and cataract system left behind by the great ice age floods. Columbia River Plateau region, central Washington, USA, September 2012.

Jeff Wilson / Field Assistant, Jason Roberts, on top of mast looking out for submerged ice, Svalbard, Spitzbergen, Norway, July 2009. Taken on location for the BBC series, Frozen Planet.

Jeff Wilson / Director, Jeff Wilson, on look out for submerged ice in front of yacht, Svalbard, Spitzbergen, Norway, July 2009, Taken on location for the BBC series, Frozen Planet.

Bryan and Cherry Alexander / Inuit hunters climbing an iceberg to scan sea-ice for game. Melville Bay, Northwest Greenland, 1980. 40 BELOW bookplate.

Bryan and Cherry Alexander / Adelie penguins (Pygoscelis adeliae) climbing an icy path to a high colony site on the side of the Lemaire Channel, Southern Ocean, Antarctica, October.

Andy Rouse / Polar Bear (Ursus maritimus) climbing out of water onto ice. Svalbard, Norway, Europe, February.

Colin Monteath / Woman climber ice climbing on grounded iceberg with cruise ship passengers looking on, Pleneau Island, Antarctic Peninsula, Antarctica

Bryan and Cherry Alexander / Polar bear (Ursus maritimus) climbing onto pressure ice. Franz Josef Land, Russia.

Bryan and Cherry Alexander / Inuit hunters scanning sea ice for game from top of iceberg. Northwest Greenland, 1980.

Steven Kazlowski / Polar bear (Ursus maritimus) climbing onto thin ice from the sea, 1002 coastal plain of the Arctic National Wildlife Refuge, Alaska

Steven Kazlowski / Polar bear (Ursus maritimus) male climbing out of sea onto iceberg floating in the Beaufort Sea, Alaska

Jeff Wilson / Camera crew working in crevasse in Gorner glacier, near Zermatt in the Swiss Alps, Switzerland, for BBC Planet Earth series, Mountains episode, 2006. (Vertical dolly filming system)

Jeff Wilson / Cameraman Ted Giffords working in crevasse in Gorner glacier, near Zermatt in the Swiss Alps, Switzerland, for BBC Planet Earth series, Mountains episode, 2006. (Vertical dolly filming system)

Jeff Wilson / Cameraman Ted Giffords working in crevasse in Gorner glacier, near Zermatt in the Swiss Alps, Switzerland, for BBC Planet Earth series, Mountains episode, 2006. (Vertical dolly filming system)

Suzi Eszterhas / Gentoo Penguin (Pygoscelis papua) climbing up iceberg, Cuverville Island, Antarctica

Neil Lucas / Looking down on Doug Allan climbing out through frozen water from drilled ice-hole in sea ice, underwater filming for BBC Life series, McMurdo Sound, Ross Sea, Antarctica, November 2008

Carol Walker / Rear view of Polar bear {Ursus maritimus} climbing over snowbank, Spitsbergen

Steven Kazlowski / Polar bear (Ursus maritimus) climbing onto a floating iceberg, Beaufort Sea, Arctic Ocean, Alaska

Steven Kazlowski / Polar bear (Ursus maritimus) climbing onto a floating iceberg, Beaufort Sea, Arctic Ocean, Alaska

Steven Kazlowski / Polar bear (Ursus maritimus) climbing out of the sea onto an iceberg floating in the Beaufort Sea, Arctic ocean, off the coast of Alaska

Steven Kazlowski / Polar bear (Ursus maritimus) climbing up an iceberg, Beaufort Sea, Arctic Ocean, Alaska

Jerry Monkman / Ice climbing on the Root Glacier, Wrangell - St Elias NP, Kennecott, Alaska, USA. Learning ice climbing on the Root Glacier in Wrangell-St. Elias N.P.

Flip Nicklin / Polar Bear (Ursus maritimus) climbing onto iceberg, Canada

Fabio Liverani / Man climbing the ice on the frozen Lillaz falls with ropes and crampons, Gran Paradiso NP, Val d'Aosta, Italy

Pete Oxford / Climber on Cotopaxi volcano (highest active volcano in world) Andes, Ecuador

Leo & Mandy Dickinson / Ron Fawcett ice climbing 1983

Colin Monteath / Climbers cross open crevasses on Fortuna Glacier retracing Sir Ernest Shackleton's epic crossing of South Georgia in 1916

Colin Monteath / Climber above Webb Glacier, dry valleys, Transantarctic Mountains, Antarctica

Doug Allan / Climbers on the Khumbu icefall, Mount Everest, Himalayas, Nepal

Lassi Rautiainen / Photographer climbing up to frozen waterfall, Finland

Doug Allan / Climber crossing a crevasse, Khumbu Ice Fall, Mt Everest, Nepal.

Colin Monteath / Ice climber on steep ice in Fox Glacier crevasse near Victoria Falls, Westland National Park, South Island, New Zealand

Colin Monteath / Ice climber on steep ice in Fox Glacier crevasse near Victoria Falls, Westland National Park, South Island, New Zealand

Colin Monteath / Ice climber on steep ice in Fox Glacier crevasse near Victoria Falls, Westland National Park, South Island, New Zealand

Colin Monteath / Ice climber on steep ice in Fox Glacier crevasse near Victoria Falls, Westland National Park, South Island, New Zealand

Flip Nicklin / Polar Bear (Ursus maritimus) climbing out of arctic waters onto ice, Canada

Leo & Mandy Dickinson / Sherpa on ladder at Khumbu icefall. Mt. Everest, Himylayas, Nepal

Leo & Mandy Dickinson / Climbers Reinhold Messner and Peter Habeller dwarfed by Khumbu icefall block. Mt. Everest, Himylayas, Nepal

Colin Monteath / Ice climbing on serac under K2, Godwin Austen Glacier, Karakoram Mountains, Pakistan

Colin Monteath / Ski mountaineer near summit with Mt Tasman behind, Westland National Park, New Zealand

Colin Monteath / Ski mountaineer on the Franz Josef Glacier near Drummond Peak, watching the sunset over the Tasman Sea, Westland National Park, New Zealand

Colin Monteath / Ski mountaineer near summit with Mt Tasman behind, Westland National Park, New Zealand

Colin Monteath / Climbers on summit ridge of Mt Scott after climbing from sea level, Antarctic Peninsula, Antarctica

Norbert Wu / Mountaineer at entrance to the Imax Crevasse, large dangerous crevasse requires ropes and guides, Antarctica

Norbert Wu / Mountaineer at entrance to the Imax Crevasse, large dangerous crevasse requires ropes and guides, Antarctica

Doug Allan / Climber crossing crevasse using ladder. Khumbu Ice Fall Mount Everest, Nepal Himylayas. Freeze Frame book plate page 145.