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Icebergs floating in the Lagoon beneath Breidamerkurjokull Glacier, Jokulsarlon (Glacial River Lagoon), southern Vatnajokull, southern area, Iceland, Polar Regions

Icebergs floating in the Lagoon beneath Breidamerkurjokull Glacier, Jokulsarlon (Glacial River Lagoon), southern Vatnajokull, southern area, Iceland, Polar Regions

Icebergs floating in the Lagoon beneath Breidamerkurjokull Glacier, Jokulsarlon (Glacial River Lagoon), southern Vatnajokull, southern area, Iceland, Polar Regions

Reflections on Loch Duich, looking south from A87 bridge towards Ratagan village, with snow on Ratagan Pass, Shell Bridge, Highlands Region, Scotland, UK, Europe

Frozen Little Langdale Tarn and snow-covered fells, near Ambleside, Lake District National Park, Cumbria, England, United Kingdom, Europe

Freezing dawn mists, Yellowstone Lake at West Thumb Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Malign River in winter, Jasper National Park, UNESCO World Heritage Site, Alberta, Canada, North America

Ice around a dock on Lake George in winter, Lake George, The Adirondacks, New York State, United States of America, North America

Freezing mists and thermal features, dawn, West Thumb Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Aerial view of arctic landscape, frozen river and the Lyngen Alps from aircraft approaching Tromso in the Arctic Circle in Northern Norway

Trees reflected in the River Brathay near Elterwater in the Lake District National Park, Cumbria, England, United Kingdom, Europe

Trees reflected in the River Brathay near Elterwater in the Lake District National Park, Cumbria, England, United Kingdom, Europe

A woman hill walker by a frozen Stickle Tarn in the Langdales, Lake District, Cumbria, England, United Kingdom, Europe

Lake Windermere in the Lake District at sunrise during the December 2010 cold snap, with temperatures below minus 10, Cumbria, England, United Kingdom, Europe

Lake Windermere in the Lake District at sunrise during the December 2010 cold snap, with temperatures below minus 10, Cumbria, England, United Kingdom, Europe

Frozen, snow dusted pastureland, arable fields and row of trees in winter, Frozen Hill, near Bath, UK.

A frozen footprint on a frozen Rydal Water during the December 2010 big chill, Lake District Cumbria, England, United Kingdom, Europe

A HUGE calving event from the South Sawyer Glacier in Tracy Arm Wilderness Area in Southeast Alaska, USA

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

Adult female leopard seal (Hydrurga leptonyx) stalking, then killing and eating an adult gentoo penguin in Paradise Bay, Antarctica, Southern Ocean

A small pod of 8 Type B killer whales (Orcinus nanus) in pack ice near Snow Hill Island Island, Weddell Sea, Antarctica, 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

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

Polar bears (Ursus maritimus) adult and cub in snow. Monacobreen Glacier, Spitsbergen in the Svalbard Archipelago, Norway

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

Polar bears (Ursus maritimus) adult and cub hunting, Monacobreen Glacier, Spitsbergen in the Svalbard Archipelago, Norway

Humpback whale (Megaptera novaeangliae) surfacing near Zodiac near the Antarctic Peninsula, Antarctica, Southern Ocean

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

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

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

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.

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

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

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.

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.

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

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

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

A well-scarred old male polar bear (Ursus maritimus) defending a fresh kill against an intruder, Monacobreen Glacier, Spitsbergen, Norway

Ice in all of its myriad forms in the Svalbard Archipelago, Norway. MORE INFO Global climate change is affecting the formation and duration of ice in all its form here in Svalbard.

A HUGE calving event from the South Sawyer Glacier in Tracy Arm Wilderness Area in Southeast Alaska, USA

Guests from the Lindblad Expedition ship National Geographic Explorer take the Polar Plunge off ice floe in the Weddell Sea, Antarctica, Southern 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.

Guests from the Lindblad Expedition ship National Geographic Explorer in the Svalbard Archipelago, Norway

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

A well-scarred old male polar bear (Ursus maritimus) defending a fresh kill against an intruder, Monacobreen Glacier, Spitsbergen, Norway

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

Two young polar bears (Ursus maritimus) feeding side-by-side on a fresh bearded seal kill near Monacobreen Glacier, Spitsbergen, Svalbard Archipelago, Norway

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

A well-scarred old male polar bear (Ursus maritimus) on a fresh bearded seal kill near Monacobreen Glacier, Spitsbergen in the Svalbard Archipelago, Norway

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

Curious Polar bear (Ursus maritimus) looking up at National Geographic Explorer, Spitsbergen, Svalbard Archipelago, Norway

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

Humpback whales (Megaptera novaeangliae) surfacing near Zodiac near the Antarctic Peninsula, Antarctica, Southern Ocean

Polar bears (Ursus maritimus) adult and cub hunting, Monacobreen Glacier, Spitsbergen in the Svalbard Archipelago, Norway

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.

Blizzard conditions cause the ocean's surface to begin to freeze in Dahlmann Bay, Antarctica, Southern Ocean. MORE INFO First signs of grease ice as the surface of the sea begins to freeze.

Polar bears (Ursus maritimus) adults and cub hunting, Monacobreen Glacier, Spitsbergen in the Svalbard Archipelago, Norway

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

A small pod of 8 Type B killer whales (Orcinus nanus) in pack ice near Snow Hill Island Island, Weddell Sea, Antarctica, Southern Ocean

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

Polar bear (Ursus maritimus) adult with seal kill. Monacobreen Glacier, Spitsbergen in the Svalbard Archipelago, Norway

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

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