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Emperor penguin (Aptenodytes forsteri), chick and adult, Snow Hill Island, Weddell Sea, Antarctica, Polar Regions

Emperor penguin chick and adulta (Aptenodytes forsteri), Snow Hill Island, Weddell Sea, Antarctica, Polar Regions

Emperor penguin chick and adult (Aptenodytes forsteri), Snow Hill Island, Weddell Sea, Antarctica, Polar Regions

Emperor penguin chicks (Aptenodytes forsteri), Snow Hill Island, Weddell Sea, Antarctica, Polar Regions

Ringed seal (Phoca hispida) pup, Billefjord, Svalbard, Spitzbergen, Arctic, Norway, Scandinavia, Europe

Ringed seal (Phoca hispida) with pup, Billefjord, Svalbard, Spitzbergen, Arctic, Norway, Scandinavia, Europe

Ringed seal (Phoca hispida) pup, Billefjord, Svalbard, Spitzbergen, Arctic, Norway, Scandinavia, Europe

Adult leopard seal (Hydrurga leptonyx) on ice in Cierva Cove, Antarctic Peninsula, Antarctica, Southern Ocean, Polar Regions

Adult crabeater seal (Lobodon carcinophaga) with fresh wound hauled out on ice floe, Neko Harbor, Andvord Bay, Antarctica, Southern Ocean, Polar Regions

Ringed seal (Phoca hispida) pup, Billefjord, Svalbard, Spitzbergen, Arctic, Norway, Scandinavia, Europe

Adult Weddell seal (Leptonychotes weddellii), hauled out on ice in Buls' Bay, Brabant Island, Antarctica, Polar Regions

Two American women tourists in Penguin Onesies on sunny day, posing on the glaciers, Antarctica, Polar Regions

Atlantic walruses (Odobenus rosmarus), Vibebukta, Austfonna, Nordaustlandet, Svalbard Islands, Arctic, Norway, Europe

Atlantic walruses (Odobenus rosmarus), Vibebukta, Austfonna, Nordaustlandet, Svalbard Islands, Arctic, Norway, Europe

Two American women tourists in Penguin Onesies on sunny day, posing on the glaciers, Antarctica, Polar Regions

Adult leopard seal (Hydrurga leptonyx) inspecting the camera above and below water at Damoy Point, Antarctica, Polar Regions

Polar bear (Ursus maritimus), Polar Ice Cap, 81 degrees, north of Spitsbergen, Arctic, Norway, Europe

Two American women tourists in Penguin Onesies on sunny day, posing on the glaciers, Antarctica, Polar Regions

Young adult polar bear (Ursus maritimus) on ice in Hinlopen Strait, Svalbard, Norway, Scandinavia, Europe

Adult polar bear (Ursus maritimus) on ice floe, Cumberland Peninsula, Baffin Island, Nunavut, Canada, North America

Male polar bear (Ursus maritimus) walking over pack ice, Spitsbergen Island, Svalbard archipelago, Arctic, Norway, Scandinavia, Europe

Adult leopard seal (Hydrurga leptonyx) inspecting the camera above and below water at Damoy Point, Antarctica, Polar Regions

Adult leopard seal (Hydrurga leptonyx), hauled out on ice in Buls' Bay, Brabant Island, Antarctica, Polar Regions

Adult gentoo penguins (Pygoscelis papua) going and returning from sea to feed, Neko Harbour in Andvord Bay, Antarctica

Aerial views of snow-capped mountains, ice fields, and glaciers on a commercial flight from Juneau to Anchorage Alaska, USA, Pacific Ocean

Aerial views of snow-capped mountains, ice fields, and glaciers on a commercial flight from Juneau to Anchorage Alaska, USA, Pacific Ocean

Adult emperor penguin (Aptenodytes forsteri) on sea ice near Snow Hill Island in the Weddell Sea, Antarctica.

Adult leopard seal (Hydrurga leptonyx) hauled out on ice floe near the Antarctic Peninsula, Southern Ocean

Guests from the Lindblad Expedition ship National Geographic Explorer enjoy a hot asado sandwich prepared by staff at BBQ on an ice floe near Adelaide Island, Antarctica

Mother polar bear (Ursus maritimus) with two coy (cubs-of-year) on multi-year ice floes in the Barents Sea off the eastern side of Heleysundet in the Svalbard Archipelago, Norway

Aerial views of snow-capped mountains, ice fields, and glaciers on a commercial flight from Juneau to Anchorage Alaska, USA, Pacific Ocean

Mother polar bear (Ursus maritimus) with two coy (cubs-of-year) on multi-year ice floes in the Barents Sea off the eastern side of Heleysundet in the Svalbard Archipelago, Norway

Adult emperor penguin (Aptenodytes forsteri) on sea ice near Snow Hill Island in the Weddell Sea, Antarctica.

Pete Pedersen from the Lindblad Expeditions ship National Geographic Sea Bird kayaking in Southeast Alaska, USA. No model or property releases available for this image.

National Geographic photographer Joel Sartore and his wife Kathy kayaking with a leopard seal near Danco Island, Antarctica

Canadian photographer Gilles Pucheu at work near his home in Yellowknife, Northwest Territories, Canada. MORE INFO Model release number GP032810.

Lindblad Expeditions guests on board the National Geographic Explorer with a lone adult emperor penguin (Aptenodytes forsteri) on sea ice, Antarctica

A curious young polar bear (Ursus maritimus) approaches the National Geographic Explorer in Woodfjorden, Spitsbergen, Svalbard Archipelago, Norway

Polar bear (Ursus maritimus) adult on snow, Monacobreen Glacier, Spitsbergen in the Svalbard Archipelago, Norway

South Sawyer Glacier calving in Tracy Arm - Fords Terror Wilderness area in Southeast Alaska, USA, Pacific Ocean

Full moon (plus 1 day) rising over icebergs in the Weddell Sea, Antarctica. MORE INFO This moonrise occurred on January 1, 2010, the night after the blue moon full of December 31, 2009.

The National Geographic Endeavour pushing through brash ice and small icebergs in the Lemaire Channel near the Antarctic Peninsula.

Adult leopard seal (Hydrurga leptonyx) hauled out on ice floe near the Antarctic Peninsula, Southern Ocean

A young polar bear (Ursus maritimus) leaping from ice floe to ice floe on multi-year ice floes in the Barents Sea off the eastern coast of EdgeØya (Edge Island) in the Svalbard Archipelago, Norway.

A younger polar bear (Ursus maritimus) scavenging a fresh bearded seal kill, Monacobreen Glacier, Spitsbergen, Norway

Aerial views of snow-capped mountains, ice fields, and glaciers on a charter flight from Santiago, Chile to Ushuaia, Argentina

Full moon (plus 1 day) rising over icebergs in the Weddell Sea, Antarctica. MORE INFO This moonrise occurred on January 1, 2010, the night after the blue moon full of December 31, 2009.

Aerial views of snow-capped mountains, ice fields, and glaciers on a commercial flight from Juneau to Anchorage Alaska, USA, Pacific Ocean

A curious young polar bear (Ursus maritimus) approaches the National Geographic Explorer in Woodfjorden, Spitsbergen, Svalbard Archipelago, Norway

Weddell Seal (Leptonychotes weddellii) hauled out on ice near the Antarctic Peninsula, southern Ocean

Adult leopard seal (Hydrurga leptonyx) hauled out on ice floe near the Antarctic Peninsula, Southern Ocean

Christian Ernist (Sweden) & Christian maldame (France during the static apnea.at the Oslo Ice Challenge 2009. Oslo, Norway

Gillieume Nery world record holder and Champion during the Oslo Ice Challenge 2009. He removed his gloves, and feel the blood rush!. Oslo, Norway

Grit salt remains the most commonly used method of removing ice and snow from the ground. All kinds of salt are effective at breaking up ice crystals, but grit salt is the preferred method for use in salt-spreading machines as long as the grit salt is kept dry. The grit salt also adds some friction to flat areas, making the ground better for tyres and shoes to grip on to.? . "

Grit salt remains the most commonly used method of removing ice and snow from the ground. All kinds of salt are effective at breaking up ice crystals, but grit salt is the preferred method for use in salt-spreading machines as long as the grit salt is kept dry. The grit salt also adds some friction to flat areas, making the ground better for tyres and shoes to grip on to.? . "

Aerial views of snow-capped mountains, ice fields, and glaciers on a commercial flight from Juneau to Anchorage Alaska, USA, Pacific Ocean

Aerial views of snow-capped mountains, ice fields, and glaciers on a charter flight from Santiago, Chile to Ushuaia, Argentina

A curious young polar bear (Ursus maritimus) approaches the National Geographic Explorer, Spitsbergen, Norway

Gentoo penguin (Pygoscelis papua) parent with two downy chicks on Pleneau Island, near the Antarctic Peninsula.