1. Department of Food and Resource Economics, and Center for Macroecology; Evolution and Climate, University of Copenhagen; Rolighedsvej 23, 1958 Copenhagen Denmark
2. Economics Division; University of Stirling; Stirling United Kingdom
3. Institute of Energy and Sustainable Development; De Montfort University; Leicester United Kingdom
4. Department of Animal and Plant Sciences; University of Sheffield; Sheffield United Kingdom
5. Environment and Sustainability Institute; University of Exeter; Cornwall United Kingdom
6. Department of Ecology and Evolutionary Biology; University of Tennessee; Knoxville TN U.S.A.