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Walkers in montane grassland environment,showing erosion by humans of footpath, Horton Plains National Park, Sri Lanka, Asia

Abandoned Dawada oasis village at Gabraoun, Touareg, Gabroun, Sahara desert, Fezzan, Libya, North Africa, Africa

Eco tourists cruise around an Iceberg graveyard in Zodiac boats, Hidden Bay, Antarctica, Polar Regions

Expedition tourists kayaking in snowy weather, with blue icebergs, Chilean Gonzalez Videla Station, Waterboat Point, Antarctica, Polar Regions

Expedition tourists kayaking in cold, snowy weather, with icebergs, Chilean Gonzalez Videla Station, Waterboat Point, Antarctica, Polar Regions

Australis expedition cruise ship anchored in front of Navarino island, Tierra del Fuego, Chile, South America

Zodiac boat, expedition tourists, landing beach, Half Moon Island, Livingston Island view, South Shetland Islands, Antarctica, Polar Regions

Visitors to an active andesite stratovolcano on White Island, off the East side of North Island, New Zealand, Pacific

Jagged mountain peaks, Raftsundet Strait, tour boat in Trollfjorden fiord, Lofoten Islands, northern Norway, Scandinavia, Europe

Visitors watching mud being ejected from the caldera floor of an active andesite stratovolcano on White Island, North Island, New Zealand, Pacific

Expedition tourists leave Half Moon Island, Livingston Island blue glaciers and evening sun, South Shetland Islands, Antarctica, Polar Regions

Sea lions (Otaria flavescens) in the Beagle Channel, Ushuaia, Tierra del Fuego, Patagonia, Argentina, South America

Views of the Chilean research base Presidente Eduardo Frei Montalva, Antarctica, Southern Ocean, Polar Regions

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

Views of the wreck of the Guvernoren, a 20th century whale processing ship, in the Enterprise Islands, Antarctica, Polar Regions

View of Roald Amundsen monument sculpture at The Fram Museum, Bygdoynesveien, Oslo, Norway, Scandinavia, Europe

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

Members of the crew on board a dahabeah, passenger river boat of the Lazuli fleet, sailing on the Nile river, Egypt, North Africa, Africa

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

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

The Lindblad Expedition ship National Geographic Explorer near glacial run-off in the Svalbard Archipelago, Norway, Arctic, Europe

The Lindblad Expedition ship National Geographic Explorer near glacial run-off in the Svalbard Archipelago, Norway, Arctic, Europe

CT Ticknor, staff member from the Lindblad Expedition ship National Geographic Explorer using binoculars in the Svalbard Archipelago, Norway, Arctic, Europe

The Lindblad Expedition ship National Geographic Explorer at Austfonna in the Svalbard Archipelago, Norway, Arctic, Europe

The Lindblad Expedition ship National Geographic Explorer at Austfonna in the Svalbard Archipelago, Norway, Arctic, Europe

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

The Lindblad Expedition ship National Geographic Explorer near Cape Fanshawe in the Svalbard Archipelago, Norway, Arctic, Europe

The Lindblad Expeditions ship National Geographic Sea Bird operating in Glacier Bay National Park, UNESCO World Heritage Site, Southeast Alaska, United States of America, North America

Guests from the Lindblad Expeditions ship National Geographic Sea Bird during Zodiac operations near a feeding sea otter in Southeast Alaska, United States of America, North America

Guests from the Lindblad Expeditions ship National Geographic Sea Bird during Zodiac operations in Tracy Arm, Southeast Alaska, United States of America, North America

Guests from the Lindblad Expeditions ship National Geographic Sea Bird during Zodiac operations in Tracy Arm, Southeast Alaska, United States of America, North America

Guests from the Lindblad Expeditions ship National Geographic Sea Bird during Zodiac operations in Tracy Arm, Southeast Alaska, United States of America, North America

The Lindblad Expedition ship National Geographic Explorer pushing through ice in the Svalbard Archipelago, Norway, Arctic, Europe

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

Aerial of a boat between the icebergs of the Ilulissat Icefjord, UNESCO World Heritage Site, Western Greenland, Denmark, Polar Regions

Motocycle on mountain road in Andean mountains near Rainbow mountain, Pitumarca District, Cuzco Region, Peru, South America

Expedition ship Polar Star operating from Ushuaia, Argentina to the Antarctic Peninsula in Antarctica, Southern Ocean, Polar Regions

Hikers on path along levada (aqueduct) of Green Cauldron (Caldeirao Verde), Madeira island, Atlantic Ocean, Portugal

Sunset at Drangarnir, the famous sea stack in Vagar island, Faroe Islands, Denmark, North Atlantic, Europe

The waterfront at Puerto Baquerizo Moreno, San Cristobal Island, Galapagos, Ecuador. The capital of the San Cristobal Canton, the town is a centre for fishing and tourism with a large population of sea lions.

Boat trip on the Senanayake Samudraya Lake, Gal Oya National Park, Sri Lanka, Indian subcontinent, South Asia

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

View of snow covered Aosta Valley from Pavillon du Mont Frety in winter, Courmayeur, Aosta Valley, Italian Alps, Italy

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

Four-wheel drive crossing a river ford between Ouarzazate and Ait Ben Haddou, Ounila River valley, Ouarzazate Province, Draa-Tafilalet region, Morocco

On the Trail with Pack Mules transporting gear to Kyanjin Gompa, Langtang Valley trek, Himalayas, Nepal, Asia

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

View of tidewater glacier cave found deep inside Neko Harbor on the western side of the Antarctic Peninsula, Polar Regions

A commercial whale watching boat being launched at the beach at low tide in Puerto Pyramides, Golfo Nuevo, Argentina, South America

View of Roald Amundsen monument sculpture at The Fram Museum, Bygdoynesveien, Oslo, Norway, Scandinavia, Europe

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

View of the Argentine base Almirante Brown, named after Guillermo Brown of the Argentine Navy, Paradise Bay, Antarctica, Polar Regions

Guest from the Lindblad Expedition ship National Geographic Explorer holding up a block of ice in the Svalbard Archipelago, Norway, Arctic, Europe

The Lindblad Expedition ship National Geographic Explorer near a glacier in the Svalbard Archipelago, Norway, Arctic, Europe

The Lindblad Expedition ship National Geographic Explorer near a glacier in the Svalbard Archipelago, Norway, Arctic, Europe

The Lindblad Expedition ship National Geographic Explorer in the Svalbard Archipelago, Norway, Arctic, Europe

The Lindblad Expedition ship National Geographic Explorer at Austfonna in the Svalbard Archipelago, Norway, Arctic, Europe

The Lindblad Expedition ship National Geographic Explorer running Zodiac operations in the Svalbard Archipelago, Norway, Arctic, Europe

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

Guests from the Lindblad Expeditions ship National Geographic Sea Bird in Glacier Bay National Park, UNESCO World Heritage Site, Southeast Alaska, United States of America, North America

Ice crystals, Science Center, Ilulissat Icefjord, UNESCO World Heritage Site, Western Greenland, Denmark, Polar Regions