Abstract
As Yang and Heijungs (Int J Life Cycle Assess https://doi.org/10.1007/s11367-018-1532-y, 2018) bring forward, there is indeed a need for “more realistic modeling of the economy” in LCA. However, what I discuss in this letter is that this does not imply that research should be “moving from completing system boundaries to more realistic modeling” or that “hybrid LCA with further linear sophistication is a step forward in the wrong direction”, as Yang and Heijungs (2018) state. Five arguments are brought forward as to why not: (1) completing system boundaries is a fundamental aspect of LCA; (2) the approach that leads to a higher accuracy in LCA will in practice remain relative and case dependent; (3) the general argument of hybrid LCA is not that every economic activity is in theory connected; (4) hybrid LCA is applied for more reasons than just completing system boundaries; and (5) hybrid LCA is more a step forward in a pragmatic data-driven direction, which is not a wrong direction. Finally, I propose that a more broad empirical study is needed to pinpoint which type of adaptation might most probably lead to higher accuracy, keeping in mind that this still will never be completely generalizable.
References
Gibon T, Schaubroeck T (2017) Lifting the fog on characteristics and limitations of hybrid LCA—a reply to “Does hybrid LCA with a complete system boundary yield adequate results for product promotion?” by Yi Yang (Int J Life Cycle Assess 22(3):456–406, doi:10.1007/s11367-016-1256-9. Int J Life Cycle Assess https://doi.org/10.1007/s11367-017-1291-1, 22, 1005, 1008
Gibon T, Wood R, Arvesen A, Bergesen JD, Suh S, Hertwich EG (2015) A methodology for integrated, multiregional life cycle assessment scenarios under large-scale technological change. Environ Sci Technol 49, 11218–11226. https://doi.org/10.1021/acs.est.5b01558
Lenzen M, Treloar GJ (2002) Differential convergence of life-cycle inventories toward upstream production layers. J Ind Ecol 6:137–160. https://doi.org/10.1162/108819802766269575
Pomponi F, Lenzen M (2018) Hybrid life cycle assessment (LCA) will likely yield more accurate results than process-based LCA. J Clean Prod 176:210–215. https://doi.org/10.1016/j.jclepro.2017.12.119
Schaubroeck T, Gibon T (2017) Outlining reasons to apply hybrid LCA—a reply to “rethinking system boundary in LCA” by Yi Yang (2017). Int J Life Cycle Assess 22:1012–1013. https://doi.org/10.1007/s11367-017-1311-1
Yang Y, Heijungs R (2018) Moving from completing system boundaries to more realistic modeling of the economy in life cycle assessment. Int J Life Cycle Assess. https://doi.org/10.1007/s11367-018-1532-y
Acknowledgements
I thank Dr. Thomas Gibon, Prof. Manfred Lenzen, and Dr. Franceso Pomponi for the valuable feedback that has improved the manuscript.
Author information
Authors and Affiliations
Corresponding author
Additional information
Responsible editor: Mary Ann Curran
Publisher’s Note
Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
Rights and permissions
About this article
Cite this article
Schaubroeck, T. Both completing system boundaries and realistic modeling of the economy are of interest for life cycle assessment—a reply to “Moving from completing system boundaries to more realistic modeling of the economy in life cycle assessment” by Yang and Heijungs (2018). Int J Life Cycle Assess 24, 219–222 (2019). https://doi.org/10.1007/s11367-018-1546-5
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11367-018-1546-5