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Sand dunes along the Atlantic coast, Namibe (Namib) desert, Iona National Park, Namibe, Angola, Africa

Relaxing in volcanic hot water waterfall, Kamuiwakka-no-taki falls, Shiretoko National Park, Hokkaido, Japan, Asia

Tabacon Hot Springs, volcanic hot springs fed from the Arenal Volcano, Arenal, Costa Rica, Central America

Tabacon Hot Springs, volcanic hot springs fed from the Arenal Volcano, Arenal, Costa Rica, Central America

The Perlan (The Pearl) dome, panoramic restaurant on top of six huge hot water tanks, one of the capital's most emblematic buildings, the Saga Museum is located inside one of the tanks, Reykjavik, Iceland, Polar Regions

Bedouins pulling water in a beautiful rock amphitheatre in the Ennedi plateau, UNESCO World Heritage Site, Chad, Africa

Tufa towers at Lac Abhe (Abbe), formed by hot springs beneath old lake at higher level, Afar Triangle, Djibouti, Africa

Tabacon Hot Springs, volcanic hot springs fed from the Arenal Volcano, Arenal, Costa Rica, Central America

People bathing in hot spring mineral water pool, Hierapolis, Pamukkale, Anatolia, Turkey, Asia Minor, Eurasia

Hot-air balloon in the sky above the castle, Amboise, UNESCO World Heritage Site, Indre-et-Loire, Loire Valley, France, Europe

Close-up of the limestone terraces formed by volcanic water depositing six inches of calcium carbonate a year, Mammoth Hot Springs and Terraces, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Tabacon Hot Springs, volcanic hot springs fed from the Arenal Volcano, Arenal, Costa Rica, Central America

Tabacon Hot Springs, volcanic hot springs fed from the Arenal Volcano, Arenal, Costa Rica, Central America

The Perlan (The Pearl) dome, panoramic restaurant on top of six huge hot water tanks, one of the capital's most emblematic buildings, the Saga Museum is located inside one of the tanks, Reykjavik, Iceland, Polar Regions

Local boys drawing water from their well in the desert between Ounianga Kebir and Faya, northern Chad, Africa

Hot Water Beach on the east coast of the Coromandel Peninsula, where thermal waters rise up from below sand, North Island, New Zealand, Pacific

Tabacon Hot Springs, volcanic hot springs fed from the Arenal Volcano, Arenal, Costa Rica, Central America

A Navajo steam bath where water is sprinkled on hot rock for steam, and with doorway closed one or two can crouch, Arizona, United States of America, North America

The hot blue waters and mineral deposits of the Blue Lagoon ipopular with bathers and good for skin complaints, Svartsengi, Iceland, Polar Regions

Man enjoying natural hot river water of Tona hotspring bath resort, Maolin, Kaoshiung County, Taiwan, Asia

Hot water in pools on calcite terraces deposited by Mammoth Hot Springs, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (U.S.A.), North America

Hierve el Agua (the water boils), hot springs, water rich in minerals bubbles up from the mountains and pours over edge, Oaxaca, Mexico, North America

Tourists relaxing in hot pools dug on beach, Hot Water Beach, Coromandel Peninsula, Waikato, North Island, New Zealand, Pacific

Hierve el Agua (the water boils), hot springs, water rich in minerals bubbles up from the mountains and pours over edge, Oaxaca, Mexico, North America

Tabacon Hot Springs, volcanic hot springs fed from the Arenal Volcano, Arenal, Costa Rica, Central America

Hierve el Agua (the water boils), hot springs, water rich in minerals bubbles up from the mountains and pours over edge, Oaxaca, Mexico, North America

Close-up of the limestone terraces formed by volcanic water depositing six inches of calcium carbonate a year, Mammoth Hot Springs and Terraces, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Hierve el Agua (the water boils), hot springs, water rich in minerals bubbles up from the mountains and pours over edge, Oaxaca, Mexico, North America

Hierve el Agua (the water boils), hot springs, water rich in minerals bubbles up from the mountains and pours over edge, Oaxaca, Mexico, North America

The Kamal factory in Bangalore, Karnataka, India that manufactures solar thermal panels for heating water.

The Kamal factory in Bangalore, Karnataka, India that manufactures solar thermal panels for heating water.

Women constructing solar cookers at the Barefoot College in Tilonia, Rajasthan, India. The Barefoot College is a worldwide charity, founded by Bunker Roy, its aims are, education, drinking water, electrification through solar power, skill development, health, women empowerment and the upliftment of rural people. The use of the cookers, vastly reduces the amount of fire wood women have to go out and collect from the forest.

Women welding joints during the construction of solar cookers at the Barefoot College in Tilonia, Rajasthan, India. The Barefoot College is a worldwide charity, founded by Bunker Roy, its aims are, education, drinking water, electrification through solar power, skill development, health, women empowerment and the upliftment of rural people. Solar cookers save women having to walk to the froest to cut down wood for cooking, thus saving the forests, and a daily chore for woman.

Women building solar cookers at the Barefoot College in Tilonia, Rajasthan, India. The Barefoot College is a worldwide charity, founded by Bunker Roy, its aims are, education, drinking water, electrification through solar power, skill development, health, women empowerment and the upliftment of rural people.

Solar cookers at the Barefoot College in Tilonia, Rajasthan, India. The Barefoot College is a worldwide charity, founded by Bunker Roy, its aims are, education, drinking water, electrification through solar power, skill development, health, women empowerment and the upliftment of rural people. The use of the cookers, vastly reduces the amount of fire wood women have to go out and collect from the forest.

Women welding joints during the construction of solar cookers at the Barefoot College in Tilonia, Rajasthan, India. The Barefoot College is a worldwide charity, founded by Bunker Roy, its aims are, education, drinking water, electrification through solar power, skill development, health, women empowerment and the upliftment of rural people. Solar cookers save women having to walk to the froest to cut down wood for cooking, thus saving the forests, and a daily chore for woman.

Women constructing solar cookers at the Barefoot College in Tilonia, Rajasthan, India. The Barefoot College is a worldwide charity, founded by Bunker Roy, its aims are, education, drinking water, electrification through solar power, skill development, health, women empowerment and the upliftment of rural people. The use of the cookers, vastly reduces the amount of fire wood women have to go out and collect from the forest.

Women welding joints during the construction of solar cookers at the Barefoot College in Tilonia, Rajasthan, India. The Barefoot College is a worldwide charity, founded by Bunker Roy, its aims are, education, drinking water, electrification through solar power, skill development, health, women empowerment and the upliftment of rural people. Solar cookers save women having to walk to the froest to cut down wood for cooking, thus saving the forests, and a daily chore for woman.

Women constructing solar cookers at the Barefoot College in Tilonia, Rajasthan, India. The Barefoot College is a worldwide charity, founded by Bunker Roy, its aims are, education, drinking water, electrification through solar power, skill development, health, women empowerment and the upliftment of rural people.

Women constructing solar cookers at the Barefoot College in Tilonia, Rajasthan, India, demonstrate how hot the device is, by holding a sheet of newspaper which instantly sets on fire in the 300 degree Celcius heat. The Barefoot College is a worldwide charity, founded by Bunker Roy, its aims are, education, drinking water, electrification through solar power, skill development, health, women empowerment and the upliftment of rural people. The use of the cookers, vastly reduces the amount of fire wood women have to go out and collect from the forest.

Women constructing solar cookers at the Barefoot College in Tilonia, Rajasthan, India. The Barefoot College is a worldwide charity, founded by Bunker Roy, its aims are, education, drinking water, electrification through solar power, skill development, health, women empowerment and the upliftment of rural people.

Women constructing solar cookers at the Barefoot College in Tilonia, Rajasthan, India. The Barefoot College is a worldwide charity, founded by Bunker Roy, its aims are, education, drinking water, electrification through solar power, skill development, health, women empowerment and the upliftment of rural people. The use of the cookers, vastly reduces the amount of fire wood women have to go out and collect from the forest.

A dried up creek that when it contains water, supports Pup fish, a highly adapted fish that can tolerate high levels of salt. Death Valley is the lowest, hottest, driest place in the USA, with an average annual rainfall of around 2 inches, some years it does not receive any rain at all.

The Kamal factory in Bangalore, Karnataka, India that manufactures solar thermal panels for heating water.

Solar photo voltaic panels and solar thermal panels providing electricity and hot water for a 16th century farm house on Bodmin Moor, Cornwall, England, United Kingdom, Europe

Saline creeks in Death Valley which is the lowest, hottest, driest place in the USA, with an average annual rainfall of around 2 inches, some years it does not receive any rain at all.

Saline creeks in Death Valley which is the lowest, hottest, driest place in the USA, with an average annual rainfall of around 2 inches, some years it does not receive any rain at all.

Solar photo voltaic panels and solar thermal panels providing electricity and hot water for a farm house on Bodmin Moor, Cornwall, England, United Kingdom, Europe

A combined heat and power plant providing hot water for space heating in Almere, Netherlands, Europe

Solar thermal panels for heating hot water with solar PV electric panels behind on a house roof in Ambleside, Lake District, Cumbria, England, United Kingdom, Europe

Saline creeks in Death Valley which is the lowest, hottest, driest place in the USA, with an average annual rainfall of around 2 inches, some years it does not receive any rain at all.

Solar thermal panels for heating hot water with solar PV electric panels behind on a house roof in Ambleside, Lake District, Cumbria, England, United Kingdom, Europe

This futuristic looking building receives hot water in an 11km long pipe from the Diemen, Almere, Netherlands, Europe

This futuristic looking building receives hot water in an 11km long pipe from the Diemen, Almere, Netherlands, Europe