1. Mekelle University, College of Dryland Agriculture and Natural Resources, Department of Land Resource Management and Environmental Protection, P.O. Box 231, Mekelle, Tigray, Ethiopia
2. Bahirdar University, College of Social Sciences, Department of Geography and Environmental Studies, P.O. Box 79, Bahirdar, Amhara, Ethiopia
3. Addis Ababa University, Center for Environmental Science, College of Natural Science, P.O. Box 1176, Addis Ababa, Ethiopia
4. University of Leuven, Department of Earth and Environmental Sciences, Division Forest, Nature, Landscape, Celestijnenlaan 200E, P.O. Box 2411, Leuven 3001, Belgium