1. a Department of Environmental and Geographical Science , University of Cape Town , Private Bag X3, 7701, South Africa
2. b Stockholm Environment Institute , Oxford Office, Florence House, 29 Grove Street, Oxford, OX2 7JT, UK
3. c Centre of Criminology , University of Cape Town , Private Bag X3, 7701, South Africa
4. d Environmental Resources Management (ERM) China , 11th Floor, Tower B, Gateway Plaza No. 18 Xia Guang Li, North Road of East Third Ring, Chaoyang District, Beijing, 100027, P. R. China