Joseph H.A. Guillaume, Australian National University, Canberra, ACT, Australia, Thorsten Arnold, Grey Bruce Centre for Agroecology, Allenford, ON, Canada, Rutger W Vervoort, Faculty of Agriculture and Environment, The University of Sydney, Australia, Tuomas Lahtinen, Aalto University, Systems Analysis Laboratory, Aalto, Finland and Anthony John Jakeman, Australian National University, Canberra, Australia