13.03.2022, Heidenau, Lower Saxony, Germany - Biogas plant, sign indicating biogas pipeline. 00A220313D497CAROEX.JPG [MODEL RELEASE: NOT APPLICABLE, PROPERTY RELEASE: NO (c) caro images / Bastian, http://www.caro-images.com, [email protected] - In case of using the picture for any purpose, please contact the agency - the picture is subject to royalty!]