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Workers pitching a path using Elterwater green slate, near Easedale Tarn in the Lake District National Park, Cumbria, UK

Workers pitching a path using Elterwater green slate, near Easedale Tarn in the Lake District National Park, Cumbria, UK

Workers pitching a path using Elterwater green slate, near Easedale Tarn in the Lake District National Park, Cumbria, UK

Forest stripped bare by logging north west of Cradle Mountain, deforestation is a big environmental and economic issue in this state, Murchison Highway, Tasmania, Australia, Pacific

Logged slopes planted with new saplings, deforestation is a big environmental and economic issue in this state, Great Western Tiers, Tasmania, Australia, Pacific

Logged slopes planted with new saplings, deforestation is a big environmental and economic issue in this state, Great Western Tiers, Tasmania, Australia, Pacific

Forest stripped bare by logging north west of Cradle Mountain, deforestation is a big environmental and economic issue in this state, Murchison Highway, Tasmania, Australia, Pacific

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

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

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

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

Young California sea lion (Zalophus californianus) which has become entangled in a gill net on Los Islotes, Gulf of California (Sea of Cortez), Baja California Sur, Mexico

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

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

Adult green sea turtle (Chelonia mydas) in the protected marine sanctuary at Honolua Bay on the northwest side of the island of Maui, Hawaii, USA

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

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

Adult green sea turtle (Chelonia mydas) in the protected marine sanctuary at Honolua Bay on the northwest side of the island of Maui, Hawaii, USA

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

Views of Mendenhall Glacier just outside Juneau, southeast Alaska, USA. This glacier is receeding at an alarming rate, probably due to climate change.

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

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

Adult female California sea lion (Zalophus californianus) which has become entangled in a gill net on Los Islotes, Gulf of California (Sea of Cortez), Baja California Sur, Mexico

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

Adult green sea turtle (Chelonia mydas) in the protected marine sanctuary at Honolua Bay on the northwest side of the island of Maui, Hawaii, USA

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), 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

Pumping oil from stoney foreshore, MPCU, Wisemen's Bridge, Sea Empress oil spill, Pembrokeshire (rr)

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

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

The church situated at the former whaling station of Grytviken. Grytviken, South Georgia, Subantarctic

Orkney Islands Sept 2011 Wave and Tidal Power shoot - out testing with the Scotrenewables machine off Kirwall - Scotrenewables Tidal Power Ltd is a renewable energy research and development business based in the Orkney Islands.

Orkney Islands Sept 2011 Wave and Tidal Power shoot - out testing with the Scotrenewables machine off Kirwall - Scotrenewables Tidal Power Ltd is a renewable energy research and development business based in the Orkney Islands.

Orkney Islands Sept 2011 Wave and Tidal Power shoot - out testing with the Scotrenewables machine off Kirwall - Scotrenewables Tidal Power Ltd is a renewable energy research and development business based in the Orkney Islands.

A tagged Blue marlin gasps for air. The Marlin has damaged skin and eyes from being tagged and released a few too many times. Vava'u Tonga in the South Pacific

Orkney Islands Sept 2011 Wave and Tidal Power shoot - out testing with the Scotrenewables machine off Kirwall - Scotrenewables Tidal Power Ltd is a renewable energy research and development business based in the Orkney Islands.

Orkney Islands Sept 2011 Wave and Tidal Power shoot - out testing with the Scotrenewables machine off Kirwall - Scotrenewables Tidal Power Ltd is a renewable energy research and development business based in the Orkney Islands.

Orkney Islands Sept 2011 Wave and Tidal Power shoot - Tidal Generation Limited - backed by Rolls Rpyce -TGL is are currently operating a 500kWe concept demonstrator unit at The European Marine Energy Centre (EMEC) Tidal site in Orkney. This has been generating since September 2010 and provides power for up to 300 homes.

Orkney Islands Sept 2011 Wave and Tidal Power shoot - out testing with the Scotrenewables machine off Kirwall - Scotrenewables Tidal Power Ltd is a renewable energy research and development business based in the Orkney Islands.