[1] James Hutton Inst, Social Econ & Geog Sci, Aberdeen AB15 8QH, Scotland
[2] Univ Nottingham, Ctr Appl Bioeth, Sutton Bonington Campus, Loughborough LE12 5RD, Leics, England
[3] Univ Copenhagen, Dept Food & Resource Econ, Rolighedsvej 25, DK-1958 Frederiksberg C, Denmark