[1] Statistics Norway, P.O. Box 8131 Dep, Oslo, 0033, Norway
[2] CICERO Center for International Climate and Environmental Research, P.O. Box 1129, Blindern, 0318 Oslo, Norway
[3] Genøk - Centre of Biosafety, Science Park, P.O. Box 6418, Tromsø, N-9294, Norway