[1] Wageningen Univ, Environm Syst Anal Grp, NL-6700 AA Wageningen, Netherlands
[2] Open Univ Netherlands, Sch Sci, NL-6401 DL Heerlen, Netherlands
[3] Netherlands Environm Assessment Agcy PBL, NL-3720 AH Bilthoven, Netherlands
[4] Univ Utrecht, Fac Geosci, Dept Earth Sci Geochem, NL-3508 TA Utrecht, Netherlands