Institute of Sustainable Development of Landscapes of the Earth e.V. (DUENE)
KEA Klimaschutz- und Energieagentur Baden-Württemberg GmbH
Carpe Europe e.V.
Baltic Environmental Forum Germany
German Aerospace Center (DLR) Institute of Transport Research
Ecocity
Naturland e.V.
B.A.U.M. e.V. – Bundesdeutscher Arbeitskreis für Umweltbewusstes Management e.V.
International Network for Environmental Management e.V. (INEM)
German Cooperative and Raiffeisen Confederation – reg. assoc.