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.