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Alpine bearberry (Arctostaphylos alpina) in fall color on the tundra, Denali National Park, Alaska, United States of America, North America

Gorely volcano, tundra plants on slopes, summit crater rims on skyline, Kamchatka, East Siberia, Russia

Mount McKinley with tundra in fall color, Denali National Park and Preserve, Alaska, United States of America, North America

A lone reindeer (Rangifer tarandus) grazing on the tundra in Russebukta, Edgeoya, Norway, Scandinavia, Europe

Alert polar bear (Ursus maritimus) on sub-arctic tundra grassland north of Churchill in Manitoba, Canada, North America

Alert polar bear (Ursus maritimus) on the rocky, sub-arctic shoreline of the Hudson Bay north of Churchill in Manitoba, Canada, North America

Muskeg, tundra wetland, with lakes and pine forest, Glenallen, Alaska, United States of America (U.S.A.), North America

Mountains and a stream through the tundra in fall color, Denali National Park and Preserve, Alaska, United States of America, North America

Mountains and tundra in fall color, Denali National Park and Preserve, Alaska, United States of America, North America

Tundra in fall colors, Denali National Park and Preserve, Alaska, United States of America, North America

Clouds and mountains and tundra in the fall, Katmai Peninsula, Alaska, United States of America, North America

Tundra in September including red patches of dwarf birch, Richardson Mountains, Yukon, Canada, North America

Antarctic tern (Sterna vittata), on the wreck of the Guvernoren in the Enterprise Islands, Antarctica, Southern Ocean, Polar Regions

View of snow-covered Half Moon Island in the South Shetland Group, Antarctica, Southern Ocean, Polar Regions

The remains of the camp where Fridtjof Nansen over-wintered with Hjalmar Johansen in 1895-96, Franz Josef Land, Russia, Arctic Ocean, Eurasia

The remains of the camp where Fridtjof Nansen over-wintered with Hjalmar Johansen in 1895-96, Franz Josef Land, Russia, Arctic Ocean, Eurasia

A view of the industrial and militarized Russian seaport city of Murmansk on the northern shore of the Kola Peninsula, Murmansk Oblast, Russia, Arctic, Europe

Curious walrus (Odobenus rosmarus rosmarus) near Apollo Island in Franz Josef Land, Russia, Arctic Ocean, Eurasia

Curious walrus (Odobenus rosmarus rosmarus) near Apollo Island in Franz Josef Land, Russia, Arctic Ocean, Eurasia

Curious walrus (Odobenus rosmarus rosmarus) near Apollo Island in Franz Josef Land, Russia, Arctic Ocean, Eurasia

Adult female polar bear (Ursus maritimus) yawning with mouth open on multi-year ice floes in Franz Josef Land, Russia, Eurasia

Chinstrap penguins (Pygoscelis antarctica), ecstatic display at breeding colony at Half Moon Island, Antarctica, Polar Regions

Adult Dovekie (Little Auk) (Alle alle) breeding area in the Norge Islands in the Svalbard Archipelago, Norway, Arctic, Europe

Adult black-legged kittiwakes (Rissa tridactyla) feeding at the base of a glacier in the Svalbard Archipelago, Norway, Arctic, Europe

Brunnich's guillemot (Uria lomvia) breeding and nesting site at Cape Fanshawe in the Svalbard Archipelago, Norway, Arctic, Europe

Brunnich's guillemot (Uria lomvia) breeding and nesting site at Cape Fanshawe in the Svalbard Archipelago, Norway, Arctic, Europe

Adult glaucous gull (Larus hyperboreus) eating common eider duckling (Somateria mollissima) in Svalbard, Norway, Arctic, Europe

Common guillemot (Uria aalge) nesting on Bear Island (Bjornoya) in the Svalbard Archipelago, Norway, Arctic, Europe

The Negribreen (Negri Glacier), in Olav V Land on the island of Spitsbergen in the Svalbard Archipelago, Norway, Arctic, Europe

An adult polar bear (Ursus maritimus) leaping from ice floe to ice floe in the Svalbard Archipelago, Norway, Arctic, Europe

Adult bull walrus (Odobenus rosmarus rosmarus) hauled out on the beach in the Svalbard Archipelago, Norway, Arctic, Europe

Adult Svalbard reindeer (Rangifer tarandus platyrhynchus) grazing within the town limits of Longyearbyen, Spitsbergen, Svalbard, Norway, Arctic, Europe

Adult gentoo penguins (Pygoscelis papua), returning and coming from the sea at Booth Island, Antarctica, Southern Ocean, Polar Regions

Guests from the Lindblad Expedition ship National Geographic Explorer at Hornsund (Horn Sound) in the Svalbard Archipelago, Norway, Arctic, Europe

Floating icebergs, Ilulissat Icefjord, UNESCO World Heritage Site, Western Greenland, Denmark, Polar Regions

Aerial of the Ilulissat Icefjord, UNESCO World Heritage Site, Western Greenland, Denmark, Polar Regions

Floating icebergs, Ilulissat Icefjord, UNESCO World Heritage Site, Western Greenland, Denmark, Polar Regions

Aerial of the Ilulissat Icefjord, UNESCO World Heritage Site, Western Greenland, Denmark, Polar Regions

Polar bear (Ursus Maritimus) on Axel Heiberg island, Nunavut, Canadian Arctic, Canada, North America

Canadian Mountie, Grise Fjord, most northern community in America, Nunavut, Canadian Arctic, Canada, North America

Gentoo penguin (Pygoscelis papua) adult feeding chick at Hannah Point on Livingston Island, Antarctica, Southern Ocean, Polar Regions

Gentoo penguin (Pygoscelis papua) breeding colony at Petermann Island, Antarctica, Southern Ocean, Polar Regions

Svalbard reindeer (Rangifer tarandus) on the tundra in Varsolbukta, Bellsund, Spitsbergen, Arctic, Norway, Scandinavia, Europe

Traditional dressed Evenki hunter with snow shoes before a traditional Evenki Yurt in Tura, Krasnoyarsk Krai, Evenki state, Russia

Aerial drone view of particular ice textures formed in the Svinafellsjokull glacier following global warming, Iceland, Polar Regions

Snow-capped mountains and tundra in fall color, Denali National Park and Preserve, Alaska, United States of America, North America

Glacial iceberg detail from ice calved off the Sawyer Glacier in Tracy Arm, Southeast Alaska, United States of America

Glacial iceberg detail from ice calved off the LeConte Glacier near Petersberg, Southeast Alaska, United States of America

A large stand of Arctic cotton (Eriophorum callitrix) in Denali National Park, Alaska, United States of America

Adult Svalbard reindeer (Rangifer tarandus platyrhynchus) grazing within the town limits of Longyearbyen, Svalbard, Norway

A young polar bear (Ursus maritimus) scavenging a fresh bearded seal kill recently vacated by old male that killed the seal, Svalbard, Norway

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

Adult polar bear (Ursus maritimus) in Holmabukta on the northwest coast of Spitsberge, Svalbard Archipelago, Norway

Adult male polar bear (Ursus maritimus) drawn to a fin whale carcass in Holmabukta in the Svalbard Archipelago, Norway

Young curious female polar bear (Ursus maritimus), on fast ice near Hinlopen Strait in the Svalbard Archipelago, Norway

Hiker in open tundra and columnar basalt in Brededal, Disko Island, Qeqertarsuaq, Baffin Bay, Greenland, Polar Regions

Antarctic tern (Sterna vittata), on the wreck of the Guvernoren in the Enterprise Islands, Antarctica, Southern Ocean, Polar Regions

Adult male polar bear (Ursus maritimus) on multi-year ice floes in Franz Josef Land, Russia, Arctic Ocean, Eurasia

Chinstrap penguins (Pygoscelis antarctica), breeding colony at Half Moon Island, Antarctica, Southern Ocean, Polar Regions

Views of Austfonna, an ice cap located on Nordaustlandet in the Svalbard archipelago in Norway, Arctic, Europe

The Global Seed Vault just outside the town of Longyearbyen on the island of Spitsbergen in Svalbard, Norway, Arctic, Europe

View of town of Longyearbyen on the island of Spitsbergen in the Svalbard Archipelago, Norway, Arctic, Europe

Views of the Vasilievbreen (Vasiliev Glacier), in Isbukta (Ice Bay) near the island of Spitsbergen in Svalbard, Norway, Arctic, Europe

An adult polar bear (Ursus maritimus) on ice floe under bright sun burst in the Svalbard Archipelago, Norway, Arctic, Europe