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A sign with the inscription biogas is seen on a pipeline in a biogas... News PhotoBiogas,Engraved Image,Finance,Fuel and Power Generation,Germany,Horizontal,TextPhotographer Collection: Photothek 2013 PhotothekNORDSTRAND, GERMANY - AUGUST 29: A sign with the inscription biogas is seen on a pipeline in a biogas plant on August 29, 2013 in Nordstrand, Germany. The plant processes natural waste from local farms into electricity, heat and environemntally-friendly fertilizer. (Photo by Michael Gottschalk/Photothek via Getty Images)