1. Department of Food and Resource Economics & Center for Macroecology, Evolution and Climate; University of Copenhagen; Rolighedsvej 23 1958 Copenhagen Denmark
2. School of Global, Urban and Social Studies; RMIT University; Melbourne Vic. 3001 Australia
3. School of Geography, Planning and Environmental Management; The University of Queensland; Brisbane Qld 4072 Australia
4. Global Conservation Program; Wildlife Conservation Society; 2300 Southern Boulevard Bronx NY 10460 USA