Assessing Greenhouse Gas Emissions of Milk Production: Which Parameters Are Essential

Uncertainties in LCA

Assessing greenhouse gas emissions of milk production: which parameters are essential?

Patricia Wolf1 • Evelyne A. Groen2 • Werner Berg1 • Annette Prochnow1, 3 • Eddie A. M. Bokkers2 • Reinout Heijungs4, 5 • Imke J. M. de Boer2

Received: 24 January 2016 / Accepted: 4 July 2016

Responsible editor: Matthias Finkbeiner

1 Leibniz Institute for Agricultural Engineering Potsdam-Bornim, Max-Eyth-Allee 100, Potsdam, 14469, Germany

2 Animal Production Systems group, Wageningen University, P.O. Box 338, 6700 AH Wageningen, the Netherlands

3 Humboldt-Universität zu Berlin, Faculty of Life Sciences, Chair Utilization Strategies for Bioresources, Hinter der Reinhardtstr. 8-18, 10115 Berlin, Germany

4 Department of Econometrics and Operations Research, VU University Amsterdam, De Boelelaan 1105, 1081 HV, Amsterdam, the Netherlands

5 Institute of Environmental Sciences, Leiden University, PO Box 9518, 2300 RA, Leiden, the Netherlands

Patricia Wolf and Evelyne A. Groen contributed equally to this paper.

* Patricia Wolf

Electronic Supplementary Material

The supplementary material contains the results of the local and the global sensitivity analysis for the restricted and the unrestricted grazing system.

Fig. S1 shows the multipliers for the most influential parameters in the LCA model for a restricted grazing system. Fig. S2 respectively for the unrestricted grazing system.

Fig. S1 Multipliers of the most influential parameters η0.05 and their corresponding emissions, for cows in a restricted grazing system

Fig. S2 Multipliers of the most influential parameters (|η|>0.05) and their corresponding emissions, for cows in a unrestricted grazing system

Figure 10 shows the total sensitivity indices (ST), of the parameters that contribute most to the output variance for the restricted grazing system. Figure 11 respectively for the unrestricted grazing system.

Fig. S3 Parameters that explain most of the output variance, given by the total sensitivity index (ST), for cows in a restricted grazing system. Only parameters that explain more than 0.001 are shown, (ST>0.001)

Fig. S4 Parameters that explain most of the output variance, given by the total sensitivity index (ST), for cows in a unrestricted grazing system. Only parameters that explain more than 0.001 are shown, (ST>0.001)

- 1 -