1. Department of Agricultural Policy, Leibniz Institute of Agricultural Development in Transition Economies, Halle (Saale), Germany
2. Center for International Development and Environmental Research, Giessen University, Germany
3. Copernicus Institute of Sustainable Development, Faculty of Geosciences, Utrecht University, Netherlands
4. College of Earth and Environmental Sciences, Lanzhou University, China
5. Martin-Luther-University Halle-Wittenberg, Halle (Saale), Germany