Abstract
Background, Aims and Scope
The consequential approach to system delimitation in LCA requires that consideration of the technologies and suppliers included are ‘marginal’, i.e. that they are actually affected by a change in demand. Furthermore, coproduct allocation must be avoided by system expansion. Vegetable oils constitute a significant product group included in many LCAs that are intended for use in decision support. This article argues that the vegetable oil market has faced major changes around the turn of the century. The aim of this study is to study the marginal supply of vegetable oil as it has shifted to palm oil and describe the product system of the new supply.
Methods
The methods for identification of marginal technologies and suppliers and for avoiding co-product allocation are based on the work of Weidema (2003). The marginal vegetable oil is identified on the basis of agricultural statistics on production volumes and prices. A co-product from palm oil production is palm kernel meal, which is used for fodder purposes where it has two main properties: protein and energy. When carrying out system expansion, these properties are taken into account.
Results
The major vegetable oils are soy oil, palm oil, rapeseed oil and sun oil. These oils are substitutable within the most common applications. Based on market trends, a shift from rapeseed oil to palm oil as the marginal vegetable oil is identified around the year 2000, when palm oil turns out to be the most competitive oil. It is recommended to regard palm oil and its dependent co-product palm kernel oil as the marginal vegetable oil. The analysis of the product system shows that the demand for 1 kg palm oil requires 4.49 kg FFB (oil palm fruit) and the displacement of 0.035 kg soybeans (marginal source of fodder protein) and 0.066 kg barley (marginal source of fodder energy).
Discussion
The identification of the marginal vegetable oil and the avoidance of co-product allocation by system expansion showed that several commodities may be affected when using the consequential approach. Hence, the product system for vegetable oils is relatively complex compared to traditional LCAs in which average technologies and suppliers are applied and in which co-product allocation is carried out by applying an allocation factor.
Conclusions
This article presents how the marginal vegetable oil can be identified and that co-product allocation between oils and meal can be avoided by system expansion, by considering the energy and protein content in the meal, which displaces a mix of the marginal sources of energy and protein for animal fodder (barley and soy meal, respectively).
Recommendations and Perspectives
The implication of a shift in the marginal vegetable oil is significant. Many LCAs on rapeseed oil have been conducted and are being used as decision support in the bio energy field. Thus, based on consequential LCA methodology, it is argued that these LCAs need to be revised, since they no longer focus on the oil actually affected.
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References
Beer T, Grant T, Morgan G, Lapszewicz J, Anyon P, Edwards J, Nelson P, Watson H, Williams D (2002): Comparison of transport fuels. Final Report (EV45A/2/F3C) to the Australian Green House Office. Canberra. http://www.greenhouse.gov.au/transport/comparison/ (accessed July 2006)
Bockisch M (1998): Fats and Oils — Handbook. AOCS Press, Illinois
Clay J (2004): World Agriculture and the Environment — A commodity-by-commodity guide to impacts and practices. World Wildlife Fund, Island Press, Washington DC
Dahl A (2005): Personal communication with Anders Dahl, Trading Manager, AarhusKarlshamn, Aarhus
De Nocker L, Spirinckx C, Torfs R (1998): Comparison of LCA and external-cost analysis for biodiesel and diesel. Paper presented at the 2nd International Conference LCA in Agriculture, Agro-industry and Forestry, Brussels, 3–4 December 1998
Ekvall T, Weidema B (2004): System boundaries and input data in consequential life cycle inventory analysis. Int J LCA 9(3) 161–171
FAOSTAT (2006): FAOSTAT Agriculture Data. Food and Agriculture Organisation of the United Nations, http://apps.fao.org/ (accessed January 2006)
FAPRI (2006): FAPRI 2006, US and World Agricultural Outlook. Food and Agriculture Research Institute, Iowa
Hansen E (2004): Status for LCA i Danmark 2003 — Introduktion til det danske LCA metode-og konsensusprojekt (English: Status on LCA in Denmark 2003 — Introduction to the Danish Methodology and Consensus Project on LCA). Rådet vedrørende genanvendelse og mindre forurenende teknologi. http://www.lca-center.dk (accessed January 2006)
McManus MC, Hammond GP, Burrows CR (2004): Life-Cycle Assessment of Mineral and Rapeseed Oil in Mobile Hydraulic Systems. J Indust Ecol 7(3–4) 163–178
Mehlin M, Zauner M, Gühnemann A, Aoki R, Vance C, Reichmuth M, Nill M, Ebert M, Zander F, Wacker M, Galster M, Schick P, Kurrer M, Veeck M (2003): Renewable Fuels for Cross Border Transportation. Directorate-General for Environment, European Commission, Brussels. http://ec.europa.eu/environment/air/pdf/renewable_fuels_final.pdf (accessed July 2006)
MPOB (2005): 2004 — Review of the Malaysian Oil Palm Industry. Economics and Industry Development Division, Malaysian Palm Oil Board, Kelana Jaya
Møller J, Thøgersen R, Kjeldsen AM, Weisberg MR, Soegaard K, Hvelplund T, Børsting CF (2000): Fodermiddeltabel-Sammensætning og foderværdi af fodermidler til kvæg (English: Feeding component table — Composition and feeding value of feeding components for cattle), Rapport nr 91 Landsudvalget for Kvæg. Foulum, Denmark
Nielsen PH, Nielsen AM, Weidema BP, Dalgaard R, Halberg N (2005): LCA food database. www.lcafood.dk. The database is available in the LCA pc-software SimaPro 7.0
Oil World (2005): Oil World Annual 2005, May 31. ISTA Mielke GmbH, Hamburg
SenterNovem (2005): Participative LCA on biofuels. Rapport 2GAVE-05.08. Ministry of Housing, Spatial Planning and the Environment, Den Haag, Netherlands
Thrane M (2004): Environmental Impacts from Danish Fish Products — Hot Spots and Environmental Policies. PhD dissertation, Department of Development and Planning, Aalborg University
Weidema BP (1993): Market aspects in product life cycle inventory methodology. J Cleaner Prod 1(3–4) 161–166
Weidema BP (1999): System expansions to handle co-products of renewable materials. Presentation Summaries of the 7th LCA Case Studies Symposium SETAC-Europe, pp 45–48
Weidema BP (2003): Market information in life cycle assessment. Environmental Project No. 863, 2003. Danish Environmental Protection Agency, Copenhagen
Weidema BP, Nielsen AM, Halberg N, Kristensen IS, Jespersen CM, Thodberg L (2005): Sammenligning af miljøpåvirkningen af konkurrerende jordbrugsprodukter (English: Comparison of the environmental impact from competiting agricultural products). Miljøprojekt Nr. 1028, Miljøstyrelsen, Copenhagen
Weidema BP, Wesnæs M (2006): Marginal production routes and co-product allocation for alcohol etoxylate from palm oil and palm kernel oil. 2.-0 LCA consultants, Copenhagen
Wightman S, Eavis RM, Walker KC, Batchelor SE, Carruthers SP, Booth EJ (1999): Life-Cycle Assessment of Chainsaw Lubricants made from Rapeseed Oil or Mineral Oil. Proceedings from 10th International Rapeseed Congress. Canberra. http://www.regional.org.au/au/gcirc/5/173.htm (accessed July 2006)
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Schmidt, J.H., Weidema, B.P. Shift in the marginal supply of vegetable oil. Int J Life Cycle Assess 13, 235–239 (2008). https://doi.org/10.1065/lca2007.07.351
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DOI: https://doi.org/10.1065/lca2007.07.351