[1
] Environmental and Geographical Science, University of Cape Town, Environmental &
Geographical Science Building, Private Bag X3, Rondebosch 7701, South Africa
[2
] African Centre for Cities, University of Cape Town, Environmental & Geographical
Science Building, Private Bag X3, Rondebosch 7701, South Africa
[3
] Stockholm Environment Institute, 9 Grove Street, Oxford OX27JT, UK