1. Udall Center for Studies in Public Policy, University of Arizona, Tucson, AZ, USA;
2. School of Landscape Architecture and Planning, University of Arizona, Tucson, AZ, USA;
3. Department of Geography and Environmental Management, University of the West of England, Bristol, UK;
4. School of Geography and Development, University of Arizona, Tucson, AZ, USA;
5. Monash South Africa, Johannesburg, South Africa;
6. Arcadis, Bristol, UK