Frank Beckenbach is Professor for Environmental and Behavioral Economics at the University of Kassel. Since 1978 he has published a wide range of articles in the field of behavioral economics, economics of growth as well as evolutionary and computational economics.Walter Kahlenborn is co-founder and Managing Director of adelphi research and adelphi consult. He carries out environmental policy research and consultancy for a broad range of national, European and international public institutions. His work focuses i.a. on: sustainable economic development, green transformation and sustainable consumption.