Foto: "<a href="https://www.ccnull.de/foto/gaspipeline-gasprom/1088819" target="_blank">Gaspipeline - Gasprom</a>" von <a href="https://www.ccnull.de/fotograf/tim-reckmann" target="_blank">Tim Reckmann</a> via <a href="https://www.ccnull.de" target="_blank">ccnull.de</a>, <a href="https://creativecommons.org/licenses/by-nc/2.0/de/" target="_blank">CC-BY-NC 2.0</a>