Traditional chalets overlooking Lake Brienz, Brienz, Bernese Oberland, Switzerland

Prinsengracht canal, Amsterdam, The Netherlands, Europe

Habitation La Griveliere', former coffee and cocoa plantation, nowadays an ecomuseum, Vieux-Habitants, Basse-Terre, Guadeloupe

Bar and restaurant at Gal Oya Lodge, Gal Oya National Park, Sri Lanka, Indian subcontinent, South Asia

Coral Reefs Monument at the waterfront of San Miguel de Cozumel, Cozumel Island, Quintana Roo State, Mexico

LiKeng Village, Wuyuan County, Shangrao, Jiangxi Province, China

Bungalow room of Eco-lodge Hara Oasis on River Draa banks in large palm grove in Agdz at foot of Djebel Kissane (Mount Kissane), Draa-Tafilet region, Morocco

Cameron Valley tea plantation, Cameron Highlands, Pahang, Malaysia

The Global Seed Vault just outside the town of Longyearbyen on the island of Spitsbergen in Svalbard, Norway, Arctic, Europe

Pitigliano, Grosseto, Tuscany, Italy

Village of Granvaux in the Vineyard terraces of Lavaux on the bank of Lake Leman, around Lausanne, Canton of Vaud, Switzerland

Eco-lodge Hara Oasis on River Draa banks in large palm grove in Agdz at foot of Djebel Kissane (Mount Kissane), Draa-Tafilet region, Morocco

Tourists inspect remote Flatey Island, Iceland

Fernwarme power plant, facade redesigned by eco-architect Friedensreich Hundertwasser, Spittelau, Vienna, Austria, Europe

Fernwarme power plant, facade redesigned by eco-architect Friedensreich Hundertwasser, Spittelau, Vienna, Austria, Europe

Fernwarme power plant, facade redesigned by eco-architect Friedensreich Hundertwasser, Spittelau, Vienna, Austria, Europe

Fernwarme power plant, facade redesigned by eco-architect Friedensreich Hundertwasser, Spittelau, Vienna, Austria, Europe

Makasutu Eco Lodge near Banjul, Gambia, West Africa, Africa

Fernwarme power plant, facade redesigned by eco-architect Friedensreich Hundertwasser, Spittelau, Vienna, Austria, Europe

Makasutu Eco Lodge near Banjul, Gambia, West Africa, Africa

Fernwarme power plant, facade redesigned by eco-architect Friedensreich Hundertwasser, Spittelau, Vienna, Austria, Europe

Makasutu Eco Lodge near Banjul, Gambia, West Africa, Africa

Eco Lodges on the canal at Tortuguero, Tortuguero National Park, Caribbean Coast, Costa Rica, Central America

Award winning eco hotel corridor, architects Geoffrey Bawa, Kandalama, Sri Lanka, Asia

A greenhouse made from waste plastic drinks bottles in the community garden at Mount Pleasant Ecological Park, Porthtowan, Cornwall, UK.

The organic community garden at Mount Pleasant Ecological Park, Porthtowan, Cornwall, UK.

An ampitheatre built with used tyres at Mount Pleasant Ecological Park, Porthtowan, Cornwall, UK.

A greenhouse made from waste plastic drinks bottles in the community garden at Mount Pleasant Ecological Park, Porthtowan, Cornwall, UK.

The largest rammed earth building in the UK, a low impact building technique at Mount Pleasant Ecological Park, Porthtowan, Cornwall, UK.

Bedzed the UK's largest eco carbon neutral housing complex in Beddington, London, England, United Kingdom, Europe

Turf roof on eco houses at the Centre for Alternative Technology in Machylleth, Wales, United Kingdom, Europe

Bedzed the UK's largest eco carbon neutral housing complex in Beddington, London, England, United Kingdom, Europe

Bedzed the UK's largest eco carbon neutral housing complex in Beddington, London, England, United Kingdom, Europe

An architect designed eco house with a wind turbine which will provide all the electricity needs of the house near Lesmahagow, Lanarkshire, Scotland, United Kingdom, Europe

Bedzed the UK's largest eco carbon neutral housing complex in Beddington, London, England, United Kingdom, Europe

Bedzed the UK's largest eco carbon neutral housing complex in Beddington, London, England, United Kingdom, Europe

Bedzed the UK's largest eco carbon neutral housing complex in Beddington, London, England, United Kingdom, Europe

Aerial views of El Castillo and the Ruins of the Mayan temple grounds at Tulum, Quintana Roo, Yucatan, Mexico. Tulum is the site of a pre-Columbian Mayan walled city which served as a major port for Coba, in the Mexican state of Quintana Roo. The ruins are situated on 12 meter 39 ft tall cliffs along the east coast of the Yucatán Peninsula on the Caribbean Sea in the state of Quintana Roo, Mexico. Tulum was one of the last cities built and inhabited by the Maya; it was at its height between the 13th and 15th centuries and managed to survive about 70 years after the Spanish began occupying Mexico. Old World diseases brought by the Spanish settlers appear to have resulted in very high fatalities, disrupting the society, and eventually causing the city to be abandoned.

Aerial views of El Castillo and the Ruins of the Mayan temple grounds at Tulum, Quintana Roo, Yucatan, Mexico. Tulum is the site of a pre-Columbian Mayan walled city which served as a major port for Coba, in the Mexican state of Quintana Roo. The ruins are situated on 12 meter 39 ft tall cliffs along the east coast of the Yucatán Peninsula on the Caribbean Sea in the state of Quintana Roo, Mexico. Tulum was one of the last cities built and inhabited by the Maya; it was at its height between the 13th and 15th centuries and managed to survive about 70 years after the Spanish began occupying Mexico. Old World diseases brought by the Spanish settlers appear to have resulted in very high fatalities, disrupting the society, and eventually causing the city to be abandoned.

Portal Maya sculpture Mayan Gateway situated in Parque Fundadores by sculptor Jose Arturo Tavares in Playa del Carmen, Riviera Maya, Quintana Roo, Mexico

The Parque Hidalgo and statue of Manuel Cepeda Peraza and The San Ildefonso Cathedral in Mérida, the capital and largest city in the Yucatan State and Yucatán Peninsula, Mexico

The Bishop's Palace or Peninsula Athenaeum and The San Ildefonso Cathedral in Mérida, the capital and largest city in the Yucatan State and Yucatán Peninsula, Mexico

Ecological skyscraper Turning Torso at Vaestra Hamnen district, built for the eco building exhibition Bo01, landmark of Malmoe, Malmoe, Skane, South Sweden, Sweden

Windpark at the freeway Autobahn A13

Windpark at the freeway Autobahn A13

Solar panels on a red tiled roof

Thikse Monastery, solar panels with a glowing lamp, Ladakh, Jammu and Kashmir, North India, Himalayas, Asia

Photovoltaic panels, solar cells, energy, roof, office building, Ingolstadt, Bavaria, Germany, Europe

New homes built by Brad Pitt's Make It Right organization in the lower ninth ward which was devastated by Hurricane Katrina; the homes are all elevated and use energy-saving technology and eye-catching design, New Orleans, Louisiana, USA

Photovoltaic panels, solar cells, energy, roof, office building, Ingolstadt, Bavaria, Germany, Europe

Photovoltaic panels, solar cells, energy, roof, office building, Ingolstadt, Bavaria, Germany, Europe

New homes built by Brad Pitt's Make It Right organization in the lower ninth ward which was devastated by Hurricane Katrina; the homes are all elevated and use energy-saving technology and eye-catching design, New Orleans, Louisiana, USA

Holiday homes, Husavik, 'house bay', Iceland, Europe

Solar village, Vauban, Freiburg im Breisgau, Baden-Wuerttemberg, Germany, Europe

Solar array on the roof of the stadium of the SC Freiburg soccer team, Freiburg im Breisgau, Baden-Wuerttemberg, Germany, Europe

Solar array on the roof of the stadium of the SC Freiburg soccer team, Freiburg im Breisgau, Baden-Wuerttemberg, Germany, Europe

Wind wheel, Landschaftspark Duisburg-Nord landscape park, a former Thyssen blast furnace plant in Meiderich, Duisburg, North Rhine-Westphalia, Germany, Europe

Solar roof, Koblenz, Rhineland-Palatinate, Germany, Europe

Detail of a photovoltaic system, solar panel, solar cells

Solar panels on the roof of a house, farm, Gasthof Benz-Muehle inn, Ottenhoefen, Muehlenrundweg, Black Forest, Baden-Wuerttemberg, Germany, Europe

Cologne's first EU GreenBuilding, new office tower of the Deutsche Krankenversicherung, German Health Insurance, Cologne, North Rhine-Westphalia, Germany, Europe

Cologne's first EU GreenBuilding, new office tower of the Deutsche Krankenversicherung, German Health Insurance, Cologne, North Rhine-Westphalia, Germany, Europe

Geothermal power plant, Latrabjarg, Iceland, Europe

Aerial view of the roofs of the solar village, Vauban-Viertel quarter, Freiburg, Baden-Wuerttemberg, Germany, Europe

Turbine Hall, powerhouse of the Walchensee Hydroelectric Power Station, hydroelectric power from Lake Walchen to Lake Kochel, Kochel, Upper Bavaria, Bavaria, Germany, Europe

Turbine Hall, powerhouse of the Walchensee Hydroelectric Power Station, hydroelectric power from Lake Walchen to Lake Kochel, Kochel, Upper Bavaria, Bavaria, Germany, Europe

Biogas plant, biomass power plant, with combined heat and power unit, CHP, and an adjacent silo, maize silage

Aerial view, solar cells on the roof of a high school, Bottrop, Ruhr Area, North Rhine-Westphalia, Germany, Europe

Futuristically designed chapel, wood passive house, domed structure, Bad Schwalbach-Langenseifen, Hesse, Germany, Europe

Metrorad-Ruhr, bike rental station, train station, Oberhausen, Ruhrgebiet area, North Rhine-Westphalia, Germany, Europe

Electricity generation by hydraulic power at the Griesheim barrage, dam with sluice, Frankfurt am Main, Hesse, Germany, Europe

Solar panels on the roof of a house in front of the Church of the Nativity, Frauenried, Irschenberg district, Upper Bavaria, Bavaria, Germany, Europe

Metrorad-Ruhr, bike rental station, train station, Oberhausen, Ruhrgebiet area, North Rhine-Westphalia, Germany, Europe

Church of the Nativity behind barnroofs with solar panels, Frauenried, Irschenberg district, Upper Bavaria, Bavaria, Germany, Europe

Electricity generation by hydraulic power at the Griesheim barrage, dam with sluice, Frankfurt am Main, Hesse, Germany, Europe

Cologne's first EU GreenBuilding, new office tower of the Deutsche Krankenversicherung, German Health Insurance, Cologne, North Rhine-Westphalia, Germany, Europe

Xcaret plus area, Eco-archeological park, Playa del Carmen, Quintana Roo state, Mayan Riviera, Yucatan Peninsula, Mexico

Visitors to the Oekomarkt organic market in the village of Lank-Latum, Meerbusch North Rhine-Westphalia, Germany, Europe

Information center with restaurant, Walchensee Hydroelectric Power Station, Kochel, Upper Bavaria, Bavaria, Germany, Europe

Aerial view, motorway bridge, A45 motorway, also known as Sauerlandlinie motorway, Gummersbach, North Rhine-Westphalia, Germany, Europe

Nuclear power plant Brokdorf and wind turbine, Brokdorf, Wilstermarsch, Kreis Steinburg district, Elbe Marshes, Schleswig-Holstein, Germany, Europe

Old sawmill about 1900, Eco-Museum, Ungersheim, Alsace, France, Europe

Cologne's first EU GreenBuilding, new office tower of the Deutsche Krankenversicherung, German Health Insurance, Cologne, North Rhine-Westphalia, Germany, Europe

Visitors to the Oekomarkt organic market in the village of Lank-Latum, Meerbusch North Rhine-Westphalia, Germany, Europe

Historic Alsation electricity substation with entrance gate, eco-museum, Ungersheim, Alsace, France, Europe

Historic Alsation half-timbered house, eco-museum, Ungersheim, Alsace, France, Europe

Storm brewing above a farm, Wisconsin, USA

Residential home of a vintner around 1540, Eco-Museum, Ungersheim, Alsace, France, Europe

Rose Garden, Parco del Buen Retiro, Madrid, Spain, Europe

Estanque grande del Retiro, Parco del Buen Retiro, Madrid, Spain, Europe

Palacio de Cristal, Parco del Buen Retiro, Madrid, Spain, Europe

Palacio de Cristal, Parco del Buen Retiro, Madrid, Spain, Europe

Rose garden, Parco del Buen Retiro, Madrid, Spain, Europe

Estanque grande del Retiro, Parco del Buen Retiro, Madrid, Spain, Europe

Mercado de Colon, Valencia, Spain, Europe

Swing to Estanque grande del Retiro, Parco del Buen Retiro, Madrid, Spain, Europe

Aerial view of business district, Milan, Lombardy, Italy

England, West Sussex, Chichester, Graylingwell Park, Modern housing with solar panels blended seamlessly in to roof tiles.

Germany, Berlin, Mitte, Citroen electric car being charged at roadside point.

England, West Sussex, Chichester, Graylingwell Park, Modern housing with solar panels blended seamlessly in to roof tiles.