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Photovoltaic solar tracker at a solar farm near Antissa, Lesbos (Lesvos), Greece. MORE INFO: Solar trackers automatically rotate and tilt photovoltaic panels to follow the sun throught the day, maximising sunlight absorpton rates. Several of these Solar farms have been built on Lesbos since 2010.

Solar farm with four Photovoltaic solar trackers, near Antissa, Lesbos (Lesvos), Greece. MORE INFO: Solar trackers automatically rotate and tilt photovoltaic panels to follow the sun throught the day, maximising sunlight absorpton rates. Several of these Solar farms have been built on Lesbos since 2010.

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

Snow covering the old barrel staves at Whalers Bay inside of the caldera at Deception Island, South Shetland Islands, Antarctica, Southern Ocean

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.

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

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

Researcher Stephanie Martin takes a blubber biopsy using an arrow fired from a crossbow of an adult blue whale (Balaenoptera musculus), South Orkney islands, Antarctica, Southern Ocean

Snow covering the ash and mud slides at Whalers Bay inside of the caldera at Deception Island, South Shetland Islands, Antarctica, Southern Ocean

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

Two young polar bears (Ursus maritimus) disputing feeding rights on a fresh bearded seal kill, Spitsbergen, Norway

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

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

Polar bear (Ursus maritimus) observed by National Geographic Explorer along the northwestern coast of Spitsbergen in the Svalbard Archipelago, 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.

View of trash washed up on the beach at Woodfjord on the northern side of Spitsbergen in the Svalbard Archipelago of Norway.

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

Researchers from OCEANITES counting penguins from the Lindblad Expedition ship National Geographic Explorer (shown here is )working in Antarctica

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

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

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.

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

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

The Fuglefjellet cliffs (411m) on Bear Island (Bjornoya) in the Svalbard Archipelago, Norway. MORE INFO These cliffs form the highest seabird cliffs in the North Atlantic Ocean.

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

Glacial iceberg detail from ice calved off the Sawyer Glacier in Tracy Arm, Southeast Alaska, USA, Pacific Ocean

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

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

Guests from the Lindblad Expedition ship National Geographic Explorer enjoy the Lemaire Channel in Antarctica

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

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.

Abandoned water boat at Whalers Bay inside of the caldera at Deception Island, South Shetland Islands, Antarctica, Southern Ocean

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

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

Two young polar bears (Ursus maritimus) disputing feeding rights on a fresh bearded seal kill, Spitsbergen, Norway

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

Calved icebergs from the glaciers at Blomstrandhalvîya in Kongsfjord on the western side of Spitsbergen in the 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

Calved icebergs from the glaciers at Blomstrandhalvîya in Kongsfjord on the western side of Spitsbergen in the Svalbard Archipelago, Norway.

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

Dead trees and vegetation waterside on a floodplane in a forest, along the Stampede Trail near Denali National Park, Alaskan Interior. Denali National Park, Alaska, USA

Bengal Tiger (Panthera Tigris Tigris), wild, two 12 month old cubs, critically endangered. Bandhavgarh Tiger Reserve, India

Bengal Tiger (Panthera Tigris Tigris), wild, adult female, critically endangered. Bandhavgarh Tiger Reserve, India

Bengal Tiger (Panthera Tigris Tigris), wild, 12 month old cub, critically endangered. Bandhavgarh Tiger Reserve, India

Bengal Tiger (Panthera Tigris Tigris), captive , adult male, critically endangered. Bozeman, Montana, United States

Bengal Tiger (Panthera Tigris Tigris), wild, adult male, critically endangered. Bandhavgarh Tiger Reserve, India

Bengal Tiger (Panthera Tigris Tigris), wild, 12 month old cub, critically endangered. Bandhavgarh Tiger Reserve, India

Bengal Tiger (Panthera Tigris Tigris), wild, two 12 month old cubs, critically endangered. Bandhavgarh Tiger Reserve, India

Bengal Tiger (Panthera Tigris Tigris), wild, adult female, critically endangered. Bandhavgarh Tiger Reserve, India

Inuit Settlement landscape of local Coal Power station, Lorino Village (Chukotskiy Peninsular) Russia, Asia.

Bengal Tiger (Panthera Tigris Tigris), wild, adult male, critically endangered. Bandhavgarh Tiger Reserve, India

Bengal Tiger (Panthera Tigris Tigris), wild, 12 month old cub, critically endangered. Bandhavgarh Tiger Reserve, India

Bengal Tiger (Panthera Tigris Tigris), wild, two 12 month old cubs, critically endangered. Bandhavgarh Tiger Reserve, India

Bengal Tiger (Panthera Tigris Tigris), wild, adult male, critically endangered. Bandhavgarh Tiger Reserve, India

Bengal Tiger (Panthera Tigris Tigris), wild, adult female, critically endangered. Bandhavgarh Tiger Reserve, India

Bengal Tiger (Panthera Tigris Tigris), captive , adult male, critically endangered. Bozeman, Montana, United States

Bengal Tiger (Panthera Tigris Tigris), wild, 12 month old cub, critically endangered. Bandhavgarh Tiger Reserve, India

Bengal Tiger (Panthera Tigris Tigris), wild, two 12 month old cubs, critically endangered. Bandhavgarh Tiger Reserve, India

Bengal Tiger (Panthera Tigris Tigris), wild, 12 month old cub, critically endangered. Bandhavgarh Tiger Reserve, India

Bengal Tiger (Panthera Tigris Tigris), wild, two 12 month old cubs, critically endangered. Bandhavgarh Tiger Reserve, India

Bengal Tiger (Panthera Tigris Tigris), wild, 12 month old cub, critically endangered. Bandhavgarh Tiger Reserve, India

Bengal Tiger (Panthera Tigris Tigris), wild, adult female with 12 month old cub, critically endangered. Bandhavgarh Tiger Reserve, India

Bengal Tiger (Panthera Tigris Tigris), wild, 12 month old cub, critically endangered. Bandhavgarh Tiger Reserve, India

Bengal Tiger (Panthera Tigris Tigris), wild, two 12 month old cubs, critically endangered. Bandhavgaarh Tiger Reserve

Bengal Tiger (Panthera Tigris Tigris), wild, adult female, critically endangered. Bandhavgarh Tiger Reserve, India