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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

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 photo, Schaffrath Solar Village, Hegerothstrasse, F & S solar concept, Buer, Gelsenkirchen, Ruhr area, 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

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

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

Solar panels mounted on so called Movers, moving in circles around their axes with the movement of the sun, Gut Erlasee Solar Park, Arnstein, Bavaria, Germany, Europe

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

Solar farm, outdoor plant, solar modules, solar power, Naturpark Altmuehltal nature park, Bavaria, Germany, Europe

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, industrial park at the harbour, solar panels, Hamm, 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

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