1. Department of Humanities and Social Sciences, Methods of empirical social research and statistics, Helmut Schmidt University, Holstenhofweg 85, D-22043 Hamburg, Germany
2. Environmental Policy, Department of Social Sciences, Wageningen University, Hollandseweg 1, 6706KN Wageningen, Netherlands
3. School of Humanities, Education and Social Sciences, Örebro University, SE-701 82 Örebro, Sweden
4. Department of Philosophy, Christian-Albrechts-Universität zu Kiel, Leibnizstr. 6, D-24118 Kiel, Germany
5. Maison des Sciences Humaines (E02 15-010) 11, Porte des Sciences, Institute of Geography and Spatial Planning, Université du Luxembourg, Campus Belval, L-4366 Esch-Belval, Luxembourg