A framework for assessing off-stream freshwater use in LCA
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Freshwater scarcity is a problem in many areas of the world and will become one of the most sensitive environmental issues in coming decades. Existing life cycle assessment (LCA) methodologies generally do not provide assessment schemes or characterization factors of the potential environmental impacts of freshwater use or freshwater resource depletion. These assessments therefore do not account for the significant environmental consequences of the loss in quality and availability of freshwater. This paper aims to develop a framework to address this methodological limitation and to support further quantitative modeling of the cause–effect chain relationships of water use. The framework includes recommendations for life cycle inventory (LCI) modeling and provides a description of possible impact pathways for life cycle impact assessment (LCIA), including indicators on midpoint and endpoint levels that reflect different areas of protection (AoP).
LCI of freshwater use aims to quantify changes in freshwater availability. The key elements affected by changes in availability are sufficient freshwater supplies for contemporary human users, ecosystems, and future generations, the latter referring to the renewability of the resource. Three midpoint categories are therefore proposed and linked to common AoP as applied in LCIA.
Results and discussion
We defined a set of water types, each representing an elementary flow. Water balances for each type allows the quantification of changes in freshwater availability. These values are recommended as results for the LCI of water use. Insufficient freshwater supplies for contemporary human users can mean freshwater deficits for human uses, which is the first midpoint impact category ultimately affecting the AoP of human life; freshwater deficits in ecosystems is the second proposed midpoint impact category and is linked to the AoP biotic environment. Finally, the last midpoint category is freshwater depletion caused by intensive overuse that exceeds the regeneration rate, which itself is ultimately linked to the AoP abiotic environment. Depending on the regional context, the development of scenarios aimed to compensate for the lack of water for specific uses by using backup technologies (e.g., saltwater treatment, the import of agricultural goods) can avoid generating direct impacts on the midpoint impact category freshwater deficits for human uses. Indirect impacts must be assessed through an extension of system boundaries including these backup technologies. Because freshwater is a resource with high spatial and temporal variability, the proposed framework discusses aspects of regionalization in relationship to data availability, appropriate spatial and temporal resolution, and software capacities to support calculations.
The framework provides recommendations for the development of operational LCA methods for water use. It establishes the link between LCI and LCIA, water-use mechanism models, and impact pathways to environmental damages in a consistent way.
Based on this framework, next steps consist of the development of operational methods for both inventory modeling and impact assessment.
KeywordsFreshwater resources Freshwater use Life cycle impact assessment Life cycle inventory
This research was carried out under the auspices of the UNEP-SETAC Life Cycle Initiative, which also provided logistical support and facilitated consultations with stakeholders.
Many people contributed to the discussions and framework development process. The authors are grateful for the contributions of further members of the WULCA Working Group (A.P. Arena, E. Aoustin, and R. Juraske) and for the individual contributions of C. Bauer, M. Berger, R. Frischknecht, M. Huijbregts, S. Humbert, A. de Schryver, R. Van Zelm, B. Weidema, and A.M. Boulay.
Finally, CIRAIG thanks its industrial partners for their financial contributions: Arcelor-Mittal, Bell Canada, Cascades, Eco Entreprises Québec/Recyc-Québec, Groupe EDF/GDF-SUEZ, Hydro-Québec, Johnson and Johnson, Le Mouvement des caisses Desjardins, Rio Tinto Alcan, RONA, SAQ, Total and Veolia Environnement.
- Ayers RS, Wescot DW (1985) Water quality for agriculture. Food and Agriculture Organization of the United Nations, Rome, Italy. available at http://www.fao.org/docrep/003/T0234E/T0234E00.HTM
- Bauer C, Zapp P (2005) Towards generic factors for land use and water consumption. In: Dubreuil A (ed) Life cycle assessment of metals: issues and research directions. SETAC—USA, Pensacola, USAGoogle Scholar
- Bauer C, Flint W, Kirk B, Mila I Canals L, Weidema B, Anton A (2006) Impact category natural resource use: freshwater, unpublished, UNEP/SETAC Life Cycle InitiativeGoogle Scholar
- Chapagain AK, Hoekstra AY (2004) Water Footprints of Nations. UNESCO-IHE, Research Report Series No. 16, The NetherlandsGoogle Scholar
- FAO (2003) Review of world water resources by country. Food and Agriculture Organization of the United Nations, RomeGoogle Scholar
- FAO (2008) Crop prospect and food situation. Food and Agriculture Organization of the United Nations, RomeGoogle Scholar
- Ecoinvent Centre (2009) Ecoinvent Data v2.1. Swiss Centre for Life Cycle Inventories, Dübendorf, Switzerland. http://www.ecoinvent.ch
- Finnveden G (1996) Resources and related impact categories. In: Udo de Haes HA (ed) Towards a methodology for life cycle assessment. SETAC—Europe, BrusselsGoogle Scholar
- Friedrich E (2001) Environmental life cycle assessment of potable water production. University of Natal, DurbanGoogle Scholar
- Frischknecht R, Steiner R, Braunschweig A, Egli N, Hildesheimer G (2008) Swiss ecological scarcity method: the new version 2006. ESU Services. available at http://www.esu-services.ch/cms/fileadmin/download/Frischknecht-2006-EcologicalScarcity-Paper.pdf
- Groombridge B, Jenkins M (1998) Freshwater biodiversity: a preliminary global assessment. World Conservation Monitoring Center, CambridgeGoogle Scholar
- Heijungs R, Guinée JB, Huppes G (1997) Impact categories for natural resources and land use. Center of Environmental Science (CML), LeidenGoogle Scholar
- Maendly R, Humbert S (2009) “Empirical characterization model and factors assessing aquatic biodiversity damages of hydropower water use”. International Journal of Life Cycle Assessment SubmittedGoogle Scholar
- Koehler A, Aoustin E (2008) Assessment of use and depletion of water resources within LCA. SETAC Europe, WarsawGoogle Scholar
- Kooistra K, Termorshuizen A, Pyburn R, University W (2006) The sustainability of cotton. Science Shop Wageningen University & Research Centre, WageningenGoogle Scholar
- Landu L, Brent AC (2006) Environmental life cycle assessment of water supply in South Africa: the Rosslyn industrial area as a case study. Water SA 32(2):249–256Google Scholar
- Lasserre F (2005) Eaux et territoires: tensions, coopérations et géopolitique de l'eau. Presses de l'Université du Québec, Sainte-FoyGoogle Scholar
- Lindeijer E, Müller-Wenk R, Steen B (2002) Impact assessment on resources and land use. In: Udo de Haes HA, Finnveden G, Goedkoop M et al (eds) Life cycle impact assessment: striving towards best practice. SETAC, PensacolaGoogle Scholar
- Lundqvist J, Gleick P (2000) Sustaining our water into the 21st Century. Stockholm Environment Institute, StockholmGoogle Scholar
- Margni M, Gloria T, Bare J, Seppälä J, Steen B, Struijs J, Toffoletto L, Jolliet O (2008) Guidance on how to move from current practice to recommended practice in Life Cycle Impact Assessment, unpublished, UNEP-SETAC Life Cycle InitiativeGoogle Scholar
- MEA (2005) Ecosystems and Human Well-Being, Millenium Ecosystem AssessmentGoogle Scholar
- Motoshita M, Itsubo N, Inaba A (2009) Development of damage assessment model for infectious diseases arising from domestic water consumption. SETAC Europe, GothenburgGoogle Scholar
- Müller-Wenk R (1999) Depletion of abiotic resources weighted on the base of 'virtual' impacts of lower grade deposits used in future, Institut fur Wirtschaft und OkologieGoogle Scholar
- Murray CJL (1996) Rethinking DALYs. In: Murray CJL, Lopez AD (eds) The global burden of disease. Harvard School of Public Health on behalf of the World Health Organization and the World Bank, Cambridge, pp 1–98Google Scholar
- Nixon SC, Lack TJ, Hunt DTE, Lallana C, Boschet AF (2000) Une utilisation durable de l'eau européenne? État, perspectives et résultats. Environmental European Agency, CopenhagueGoogle Scholar
- OECD (2004) OECD key environmental indicators. OECD Environmental Directorate, ParisGoogle Scholar
- Sanjuan N, Ubeda L, Clemente GG, Mulet AA, Girona FF (2005) LCA of integrated orange production in the Comunidad Valenciana (Spain). Int J Agric Resour Gov Eco 4(2):163–177Google Scholar
- Smakhtin V, Revenga C, Döll P (2004) Taking into account environmental water requirements in global-scale water resources assessments. Comprehensive Assessment Report http://www.iwmi.cgiar.org/Assessment/FILES/pdf/publications/ResearchReports/CARR2.pdf
- Svobodová Z, Lloyd R, Máchová J, Vykusová B (1993) Water quality and fish health. EIFAC Technical Paper. No. 54. Food and Agriculture Organization of the United Nations, Rome, ItalyGoogle Scholar
- Udo de Haes H, Finnveden G, Goedkoop M, Hauschild M, Hertwich E, Hofstetter P, Jolliet O, Klöpffer W, Krewitt W, Lindeijer E, Müller-wenk R, Olsen SI, Pennington DW, Potting J, Steen B (2002) Life-cycle impact assesment: striving towards best practice. SETAC, PensacolaGoogle Scholar
- UNCSD (1997) Inventaire exhaustif des ressources mondiales en eau douce, Economic and Social CouncilGoogle Scholar
- UNESCO (2006) The 2nd UN World Water Development Report: 'Water, a shared responsibility'Google Scholar
- USGS (2003) Ground-Water Depletion Across the Nation, US Geological Survey, Reston, USAGoogle Scholar
- Van Zelm R, Rombouts M, Snepvangers J, Huijbregts MAJ (2008) Desiccation due to groundwater extraction in The Netherlands in LCIA. SETAC Europe, WarsawGoogle Scholar
- Weidema B (2009) A Canadian LCA database: challenges and opportunities. Americana 2009, Montreal, CanadaGoogle Scholar
- World Resource Institute (2004). EarthtrendGoogle Scholar
- WWF (2007) Making water. Desalination: option or distraction for a thirsty world? Wild World FoundationGoogle Scholar