Advertisement

Assessing freshwater use impacts in LCA, part 2: case study of broccoli production in the UK and Spain

  • Llorenç Milà i CanalsEmail author
  • Ashok Chapagain
  • Stuart Orr
  • Jonathan Chenoweth
  • Assumpció Anton
  • Roland Clift
WATER USE IN LCA

Abstract

Background, aim and scope

Milà i Canals et al. (Int J Life Cycle Ass 14(1):28-42, 2009) referred to as ‘Part 1’ in this paper) showed that impacts associated with use of freshwater must be treated more rigorously than is usual in life cycle assessment (LCA), going beyond the conventional consideration only of ‘blue’ water (i.e. irrigation and other abstractions), and suggested an operational method to include the impacts on freshwater ecosystems (freshwater ecosystem impact) and abiotic resource depletion (freshwater depletion). The inclusion of water-related impacts in LCA is of paramount importance, particularly for agricultural systems due to their large water consumption worldwide. A case study of UK consumption of broccoli grown in the UK and Spain is presented here to illustrate the method suggested in Part 1.

Materials and methods

Water footprint (WF) and life cycle impact assessment (LCIA) methods presented in Part 1 are applied to six different and synchronic supply chains providing broccoli during the British colder months (November–April); four of these chains refer to broccoli produced in Spain and the other two are based on frozen British produce. In addition, four UK-based supply chains delivering fresh broccoli from April to November are studied to provide a year-round perspective.

Results

Using WF accounting methods helps to provide a richer picture of the total water consumption associated with growing broccoli. Including the volumes of water consumed in the life cycle inventory (LCI), assessed following the WF approach (evaporative uses of irrigation water and soil moisture), shows that the total water consumption does not vary greatly between UK and Spanish broccoli production. However, when impact assessment indicators based on the water use per resource ratio are applied, water use in Spain is shown to be much more critical, with significantly higher impact for Spanish cultivation. While the largest component of water use in Spain is linked to irrigation, the study reveals other important uses in the life cycle of vegetables, namely direct use of water for cooking and sanitation, land use effects on the water cycle and electricity production.

Discussion

The results highlight the importance of distinguishing between different water volumes and sources in the different LCA phases: LCI (with and without full WF consideration) and LCIA. Traditional LCI results may be misleading when comparing irrigated systems in regions with differing water scarcity. The WF estimates are more relevant for sourcing strategies, as they show the total water requirements of crops including both irrigation water use as well as the use of green water (effective rainfall stored as soil moisture). Finally, LCIA results show the potential impacts of water consumption on freshwater ecosystems and future freshwater availability.

Conclusions

This methodological framework improves the representation of impacts associated with water use in LCA. This helps in identifying the hotspots of the production system in terms of potential impacts to freshwater ecosystems, as well as in identifying where investments for water-saving may have the greatest benefit. In addition, this approach addresses a regional specific issue, water scarcity, which may often be closer to critical thresholds than other environmental impacts.

Recommendations and perspectives

The method should be tested with further case studies in order to confirm the suitability and necessity of the LCI modelling requirements and LCIA characterisation factors such as the explicit inclusion of evaporative water losses. The WF approach can benefit from experience of systems analysis gained in LCA, while LCA may benefit from the detailed accounting framework embodied in the WF approach, as illustrated in this paper. Because the purposes of the two tools are different, they will continue to evolve separately, but complementarity in application should guide this development.

Keywords

Broccoli Food supply chain Water footprint Water resource Freshwater ecosystem impact Freshwater depletion Life cycle assessment Life cycle inventory Life cycle impact assessment 

Notes

Acknowledgements

The RELU project RES-224-25-0044 (http://www.bangor.ac.uk/relu) funded the data collection for the case study on broccoli LCA. Meteorological data for Lincolnshire were provided by Climate Enquiry Officer UK Met Office, and data for Murcia were provided by Sección de Climatología y Relaciones con los Usuarios Centro Meteorológico Territorial en Murcia. Since the first draft in January 2008, this work has been presented in the 35th LCA Discussion Forum (Zurich, CH, 5 June 2008), the 6th International Conference on LCA in the Agri-Food Sector (Zurich, CH, 12–14 November 2008), and in the Water Footprint Working Group Meeting in Woking (UK), 18 December 2008; comments from and discussions with the participants in these events are kindly appreciated. The thorough comments of two reviewers have improved the clarity and transparency of this paper and are kindly appreciated.

Supplementary material

11367_2010_187_MOESM1_ESM.pdf (37 kb)
ESM 1 (PDF 36.6 KB)

References

  1. Alcamo J, Henrich T, Rösch T (2000) World Water in 2025—global modeling and scenario analysis for the World Commission on Water for the 21st Century. Centre for Environmental System Research, University of Kassel, Kassel. Available at http://www.usf.uni-kassel.de/usf/archiv/dokumente/kwws/kwws.2.pdf
  2. Allen RG, Pereira LS, Raes D, Smith M (1998) Crop evapotranspiration—guidelines for computing crop water requirements. FAO, RomeGoogle Scholar
  3. Althaus H-J, Chudacoff M, Hellweg S, Hischier R, Jungbluth N, Osses M, Primas A (2004) Life cycle inventories of chemicals. Ecoinvent report No 8. Swiss Centre for Life Cycle Inventories, DübendorfGoogle Scholar
  4. Chapagain AK, Hoekstra AY (2004) Water footprints of nations. UNESCO-IHE, DelftGoogle Scholar
  5. Chapagain AK, Orr S (2008) UK Water Footprint Report: the impact of the UK’s food and fibre consumption on global water resources. WWF-UK, GodalmingGoogle Scholar
  6. Chapagain AK, Orr S (2009) An improved water footprint methodology to link global consumption to local water resources: a case study of Spanish tomato consumption. J Environ Manage 90(2):1219–1228CrossRefGoogle Scholar
  7. Chapagain AK, Hoekstra AY, Savenije HHG, Gautam R (2006) The water footprint of cotton consumption: an assessment of the impact of worldwide consumption of cotton products on the water resources in the cotton producing countries. Ecol Econ 60(1):186CrossRefGoogle Scholar
  8. Custodio E (2002) Aquifer overexploitation: what does it mean? Hydrogeol J 10:254–277CrossRefGoogle Scholar
  9. FAO (1993): CLIMWAT for CROPWAT: A climatic database for irrigation planning and management. Page Developed by: Martin Smith Irrigation and Drainage Paper No. 49. Food and Agriculture Organization of the United Nations, Rome, ItalyGoogle Scholar
  10. FAO (2003) AQUASTAT 2003. Food and Agriculture Organization of the United Nations, Rome, ItalyGoogle Scholar
  11. Frischknecht R, Steiner R, Braunschweig A, Egli N, Hildesheimer G (2006) Swiss ecological scarcity Method: The new version 2006. In The Seventh International Conference on EcoBalance, Nov 14-16, 2006, Tsukuba, Japan, available from www.esu-services.ch/ubp06
  12. Edwards-Jones G, Milà i Canals L, Hounsome N, Truninger M, Koerber G, Hounsome B, Cross P, York EH, Hospido A, Plassmann K, Harris IM, Edwards RT, Day GAS, Tomos AD, Cowell SJ, Jones DL (2008) Testing the assertion that ‘local food is best’: the challenges of an evidence based approach. Trends Food Sci Tech 19:265–274CrossRefGoogle Scholar
  13. Hospido A, Milà i Canals L, McLaren SJ, Clift R, Truninger M, Edwards-Jones G (2009) The role of seasonality in lettuce consumption: a case study of environmental and social aspects. Int J Life Cycle Ass 14(5):381–391CrossRefGoogle Scholar
  14. IWMI (2007) IWMI online climate summary service portal. International Water Management Institute, Sri LankaGoogle Scholar
  15. Milà i Canals L, Cowell SJ, Sim S, Basson L (2007a) Comparing domestic versus imported apples: a focus on energy use. Environ Sci Pollut R 14(5):338–344CrossRefGoogle Scholar
  16. Milà i Canals L, Romanya J, Cowell SJ (2007b) Method for assessing impacts on life support functions (LSF) related to the use of ‘fertile land’ in life cycle assessment (LCA). J Clean Prod 15:1426–1440CrossRefGoogle Scholar
  17. Milà i Canals L, Muñoz I, Hospido A, Plassmann K, McLaren SJ, Edwards-Jones G, Hounsome B (2008): Life cycle assessment (LCA) of domestic vs. imported vegetables. Case studies on broccoli, salad crops and green beans. CES Working Papers 01/08 Available from www.surrey.ac.uk/CES
  18. Milà i Canals L, Chenoweth J, Chapagain AK, Orr S, Antón A, Clift R (2009) Assessing freshwater use impacts in LCA Part 1: inventory modelling and characterisation factors for the main impact pathways. Int J Life Cycle Ass 14(1):28–42CrossRefGoogle Scholar
  19. Muñoz I, Milà i Canals L, Clift R (2008) Consider a spherical man—a simple model to include human excretion in life cycle assessment of food products. J Ind Ecol 12(4):521–538CrossRefGoogle Scholar
  20. Muñoz I, Milà i Canals L, Fernández-Alba A (In press) Life Cycle Assessment of water supply in the Spanish Mediterranean basin: the Ebro river water transfer versus the AGUA Program. J Ind EcolGoogle Scholar
  21. Van der Walt IJ, Struwig A, van Rensburg JRJ (2004) Forestry as a streamflow reduction activity in South Africa: discussion and evaluation of the proposed procedure for the assessment of afforestation permit applications in terms of water sustainability. GeoJournal 61:173–181CrossRefGoogle Scholar

Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  • Llorenç Milà i Canals
    • 1
    • 2
    Email author
  • Ashok Chapagain
    • 3
  • Stuart Orr
    • 4
  • Jonathan Chenoweth
    • 2
  • Assumpció Anton
    • 5
  • Roland Clift
    • 2
  1. 1.Safety & Environmental Assurance CentreUnileverSharnbrookUK
  2. 2.Centre for Environmental StrategyUniversity of SurreyGuildfordUK
  3. 3.WWF—UKGodalmingUK
  4. 4.WWF—InternationalGlandSwitzerland
  5. 5.IRTACabrilsSpain

Personalised recommendations