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Neatly-stacked dried cow dung, hand-formed into pats to be used for fuel for cooking, at a farm in Agra, Uttar Pradesh, India

Neatly-stacked dried cow dung, hand-formed into pats to be used for fuel for cooking, at a farm in Agra, Uttar Pradesh, India

Neatly-stacked dried cow dung, hand-formed into pats to be used for fuel for cooking, at a farm in Agra, Uttar Pradesh, India

Neatly-stacked dried cow dung, hand-formed into pats to be used for fuel for cooking, at a farm in Agra, Uttar Pradesh, India

Geothermal plant near M√Ωvatn at sunset, Nor√∞urland eystra, Nordurland, Northeast Iceland, Iceland, Europe

Solar panels and stacked firewood in wintertime near Schluchsee (Schluch Lake), Black Forest, Baden-Wuerttemberg, Germany, Europe

Photovoltaic cells, solar panels installed on a roof, Guenthersbuehl, Middle Franconia, Bavaria, Germany, Europe

Photovoltaic cells, solar panels mounted in a field, Oberruesselbach, Middle Franconia, Bavaria, Germany, Europe

Photovoltaic cells, solar panels installed on a roof, Oberruesselbach, Middle Franconia, Bavaria, Germany, Europe

Photovoltaics, solar panels in a field near Oberruesselbach, Middle Franconia, Bavaria, Germany, Europe

Photovoltaics, solar panels in a field near Oberruesselbach, Middle Franconia, Bavaria, Germany, Europe

Photovoltaic cells, sonar panels mounted in a field, Oberruesselbach, Middle Franconia, Bavaria, Germany, Europe

Photovoltaics, solar panels in a field near Oberruesselbach, Middle Franconia, Bavaria, Germany, Europe

Baburenmolen historic windmill with modern wind turbines in background, Bolsward, Friesland, The Netherlands, Europe

Largest tracking photovoltaic solar power station in the world near Arnstein, Bavaria, Germany, Europe

Photovoltaic system on the roof of the mountain station of the Arber Mountain Railway at Mount Grosser Arber near Bayerisch Eisenstein in the Bavarian Forest, Bavaria, Germany, Europe

A bottle of ethanol and some of the materials ethanol can be made of at the National Renewable Energy Laboratory, operated by the US Department of Energy, where scientists are developing economical processes for making cellulosic ethanol from non-edible p

Photovoltaic system on the roof of the mountain station of the Arber Mountain Railway at Mount Grosser Arber near Bayerisch Eisenstein in the Bavarian Forest, Bavaria, Germany, Europe

Big Photovoltaic system, solar plant, in snow, Oberruesselbach, Middle Franconia, Bavaria, Germany, Europe

Solar installation on the roof of the Bamberg public utility company, behind it the Otto church, Bamberg, Bavaria, Germany, Europe

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

Solar installation on the roof of the Bamberg public utility company, Bamberg, Bavaria, Germany, Europe

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

Photovoltaic solar collectors at the largest photovoltaic power plant in the US, operated by SunEdison, generates 8.22 megawatts, San Luis Valley, Alamosa, Colorado, 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

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

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

Aerial picture, roof with solar panels, rotunda, Alt-Oer retirement home, Oer-Erkenschwick, Ruhr Area, North Rhine-Westphalia, Germany, Europe

Charcoal kiln is set on fire by charburner, Walpersdorf, Siegen-Wittgenstein, North Rhine-Westphalia, Germany

A solar photovoltaic facility, built on top of a former landfill at the U.S. Army's Fort Carson uses contaminated land to generate renewable energy and generates 3, 200 megawatt-hours of power every year, Colorado Springs, Colorado, USA

A solar photovoltaic facility, built on top of a former landfill at the U.S. Army's Fort Carson uses contaminated land to generate renewable energy and generates 3, 200 megawatt-hours of power every year, Colorado Springs, Colorado, USA

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

Turbine hall of Walchensee Hydroelectric Power Station, Kochel, Upper Bavaria, Bavaria, Germany, Europe

Aerial view, Akademie Mont-Cenis building, solar power station, Herne-Sodingen, Europe's largest solar facade, convention center, hotel, ASB Begegnungs- und Pflegezentrum Mont-Cenis retirement home, Herne, Ruhr area, North Rhine-Westphalia, Germany, Europ

Aerial view, landfill at a recycling depot with solar panels, Bottrop, Ruhr Area, North Rhine-Westphalia, Germany, Europe

Aerial view, Akademie Mont-Cenis building, solar power station, Herne-Sodingen, Europe's largest solar facade, convention center, hotel, ASB Begegnungs- und Pflegezentrum Mont-Cenis retirement home, Herne, Ruhr area, North Rhine-Westphalia, Germany, Europ

Construction of a large photovoltaic system on several rooftops, 16000 square metres, Gelsenkirchen, North Rhine-Westphalia, Germany, Europe

Construction of a large photovoltaic system on several rooftops, 16000 square metres, Gelsenkirchen, North Rhine-Westphalia, Germany, Europe

Construction of a large photovoltaic system on several rooftops, 16000 square metres, Gelsenkirchen, North Rhine-Westphalia, Germany, Europe

Construction of a large photovoltaic system on several rooftops, 16000 square metres, Gelsenkirchen, North Rhine-Westphalia, Germany, Europe

Aerial picture, roof with solar panels, rotunda, Alt-Oer retirement home, Oer-Erkenschwick, Ruhr Area, North Rhine-Westphalia, Germany, Europe

Solar power plant in a field in front of Meldorfer Cathedral, photovoltaic system, Meldorf, Dithmarschen, Schleswig-Holstein, Germany, Europe

A solar electric generating system operated by Sunray Energy; the parabolic mirrors focus the sun's rays to heat an oil-filled tube, the heat produces steam to run an electricity-generating turbine, Daggett, Mojave Desert, southern California, USA

Metal pipes at the Walchenseekraftwerk Hydroelectric Power Station, Kochel am See, Bavaria, Germany, Europe

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

Velan Hut, Cabane du Velan, of the Swiss Alpine Club, SAC, at the foot of the Grand Combin Mountain, Valais Alps, Valais, Switzerland, Europe

Cargo ship "Wilson Astakos" sailing in front of an offshore wind farm in the oresund outside Copenhagen, Denmark, Europe

Wood pellets for heating packaged in sacks, at the WestPellets company in Titz, North Rhine-Westphalia, Germany, Europe

Part of a 133-turbine, 212.8-megawatt wind farm built by Invenergy Wind LLC and DTE Energy, Breckenridge, Michigan, USA, America

Aerial view, damage caused by sinking of the reclaimed land, Alpincenter Bottrop, with solar panels on the roofs, Bottrop, Ruhr Area, North Rhine-Westphalia, Germany, Europe

Solar furnace, le Grand Four Solaire d'Odeillo, 1000 kW thermal power station, Font-Romeu-Odeillo-Via, Pyrenees-Orientales, Northern Catalonia, France, Europe, PublicGround