1. Alberta Agriculture and Forestry; J.G.O'Donoghue Building, Room #302, 7000-113 Street Edmonton AB T6H 5T6 Canada
2. Department of Resource Economics and Environmental Sociology, University of Alberta, 515 General Services Building, Edmonton, AB, T6G 2H1, Canada, and formerly visiting Research Associate Professor, School of Agricultural and Resource Economics; University of Western Australia; Perth 6009 WA
3. Agriculture and Agri-Food Canada; Lethbridge Research Centre; 5403 - 1 Avenue South, PO Box 3000 Lethbridge AB T1J 4B1 Canada
4. Department of Resource Economics and Environmental Sociology, University of Alberta, 515 General Services Building, Edmonton, AB, T6G 2H1, Canada, and School of Agricultural and Resource Economics; University of Western Australia; Perth 6009 WA