[1] Clermont Univ, VetAgro Sup, CALITYSS, F-63000 Clermont Ferrand, France
[2] GEM Etud & Strategie agroalimentaire, F-75013 Paris, France
[3] LEI, NL-6700 AA Wageningen, Netherlands
[4] LEI, NL-2502 LS The Hague, Netherlands
[5] ETH, ETH Zentrum, Inst Environm Decis, CH-8092 Zurich, Switzerland