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The Trans Alaska Oil Pipeline running on refridgerated support to stop oil heat melting the permafrost,Mount Hayes (4116m) and the Alaska Range in the background, Alaska, USA

Cactus silhouetted against lightning, Tucson, Arizona, United States of America (U.S.A.), North America

Glacier ice melting and icebergs at Perito Moreno, Moreno Glacier, Parque Nacional Los Glaciares, UNESCO World Heritage Site, Patagonia, Argentina, South America

Heliostats at the solar energy scientific research centre, Tabernas, Almeria, Andalusia, Spain, Europe

Artesian well at Fayagua, between Pajara and La Pared, Fuerteventura, Canary Islands, Spain, Atlantic, Europe

Curved concave reflector panels desalinisation plant at the solar energy scientific research centre, Tabernas, Almeria, Andalusia, Spain, Europe

Curved concave reflector panels desalinisation plant at the solar energy scientific research centre, Tabernas, Almeria, Andalusia, Spain, Europe

Heliostats reflect sunrays to receiver tower, solar energy scientific research centre, AORA Tulip System, Tabernas, Almeria, Andalusia, Spain, Europe

Heliostats reflecting sun rays, solar energy scientific research centre, AORA Tulip System, Tabernas, Almeria, Andalusia, Spain, Europe

Barragem do Alqueva dam, part of the multipurpose water management project on the Rio Guadiana river, hydro-electricity generation electricity power lines, Moura, Portugal, Europe

Solar panel array in field in countryside providing domestic energy near village of Rogil, Algarve district, Portugal, Europe

Heliostats and central receiver CESA-1 Tower at solar energy scientific research centre, Tabernas, Almeria, Andalusia, Spain, Europe

Array of solar panels on a bright sunny day, Sierra Alhamilla, near Nijar, Almeria, Andalusia, Spain, Europe

Desalinisation plant at the solar energy scientific research centre, Tabernas, Almeria, Andalusia, Spain, Europe

Male Thomson's gazelle (Gazella thomsonii) fighting, Masai Mara National Reserve, Kenya, East Africa, Africa

Hoover Dam on the Colorado River forming the border between Arizona and Nevada, United States of America, North America

Hoover Dam on the Colorado River forming the border between Arizona and Nevada, United States of America, North America

Hoover Dam on the Colorado River forming the border between Arizona and Nevada, United States of America, North America

Hiker running on trail and the Matterhorn, 4477m, Zermatt Alpine Resort, The Valais, Swiss Alps, Switzerland, Europe

El Tatio Geysers, at 4300m above sea level El Tatio is the world's highest geyser field, the area is ringed by volcanoes and fed by 64 geysers, Atacama Desert, Norte Grande, Chile, South America

A climber hangs above the sea on the huge west face of Dun Mingulay cliff, Mingulay Island, Outer Hebrides, Scotland, United Kingdom, Europe

An ice climber makes his way up a frozen waterfall near Cogne, above the Aosta Valley, northern Italy, Europe

A climber looks up towards the 800 metre Tsaranoro Be (Big Tsaranoro) Monolith, Andringitra National Park, Southern Madagascar, Africa

A climber tackles a difficult boulder problem on the glacial moraine at Tangnag, near Mera Peak and Mount Everest, Khumbu Region, Nepal, Himalayas, Asia

Rock climber tackles a very overhanging route on the famous limestone cliffs of the Gorge du Tarn in the Massif Central, near Millau and Rodez, south west France, Europe

Two rock climbers making their way up a very difficult route on the 450 metre monolith of Karimbony, Tsaranoro Massif, Andringitra National Park, Southern Madagascar, Africa

A hiker enjoys solitude in the hills above Hay-on-Wye, on the eastern edge of the Brecon Beacons National Park, Monmouthshire, Wales, United Kingdom, Europe

Blue wildebeest (brindled gnu) (Connochaetes taurinus) herd running, Ngorongoro Conservation Area, Tanzania, East Africa, Africa

View of buildings and trail lights around Shibuya Station area at night, Shibuya District, Kamiyamacho, Shibuya City, Tokyo, Honshu, Japan

View of Godzilla's head and Kabukicho neon lit street at night, Shinjuku City, Kabukicho, Tokyo, Honshu, Japan

A woman climbing on cliffs opposite Cathedral Rock, near El Capitan, Yosemite Valley, California, United States of America, North America

Steam emitted from the New York Steam System, dating back to 1882 providing steam to heat, cool or disinfect around 1,700 buildings, New York, United States of America, North America

Steam emitted from the New York Steam System, dating back to 1882 providing steam to heat, cool or disinfect around 1,700 buildings, New York, United States of America, North America (Excess steam is vented from orange and white funnels known as stacks.)

Vervet monkey (Chlorocebus), Gombe Stream National Park, Lake Tanganyika, Tanzania, East Africa, Africa

Children bringing coffee cherries to a coffee washing station, Rutsiro district, Northern province, Rwanda, East Africa, Africa