1. Faculty of Spatial Sciences, University of Groningen, Groningen, the Netherlands
2. Centre for Tourism, Innovation and Culture, University of Southern Denmark, Kolding, Denmark
3. Faculty of Mathematics, Informatics and Natural Sciences, University of Hamburg, Hamburg, Germany
4. Ecological Economics, Carl von Ossietzky University of Oldenburg, Oldenburg, Germany
5. Biology and Environmental Sciences, Applied Geography and Environmental Planning Working Group, Carl von Ossietzky University Oldenburg, Oldenburg, Germany