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Guillaume Majeau-Bettez
B.Sc. (McGill), M.Sc., Ph.D. (NTNU)

Research interests and affiliations

Research interests
  • Life cycle assessment
  • Material flow analysis
  • Environmentally extended input-output analysis
  • Industrial ecology
  • Circular economy
  • Sustainable development & mitigation of climate change
  • Recycling and waste managment strategies
  • Prospective environmental analyses of technology transitions
  • Electrification of transports
  • Open-source software development
  • Operations research and environmental optimisation
Expertise type(s) (NSERC subjects)
  • 1503 Air and noise pollution
  • 7003 Renewable and non-renewable resources management


Recent publications
Journal article
Lonca, G., Lesage, P., Majeau-Bettez, G., Bernard, S. & Margni, M. (2020). Assessing scaling effects of circular economy strategies: A case study on plastic bottle closed-loop recycling in the USA PET market. Resources, Conservation and Recycling, 162, 10 pages. Retrieved from
Journal article
Agez, M., Wood, R., Margni, M., Stromman, A.H., Samson, R. & Majeau-Bettez, G. (2020). Hybridization of complete PLCA and MRIO databases for a comprehensive product system coverage. Journal of Industrial Ecology, 24(4), 774-790. Retrieved from
Journal article
Agez, M., Majeau-Bettez, G., Margni, M., Stromman, A.H. & Samson, R. (2020). Lifting the veil on the correction of double counting incidents in hybrid life cycle assessment. Journal of Industrial Ecology, 24(3), 517-533. Retrieved from
Journal article
Hung, C.R., Ellingsen, L.A.-W. & Majeau-Bettez, G. (2020). LiSET: A Framework for Early-Stage Life Cycle Screening of Emerging Technologies. Journal of Industrial Ecology, 24(1), 26-37. Retrieved from


Guillaume Majeau-Bettez strives to better quantify the environmental consequences of our technology choices. His research pushes further the level of integration of complex-system analysis tools, in order to better inform environmental strategic decisions, especially those of the industrial and governmental partners of the International Life Cycle Chair (ILCC) and the Advanced Recycling and Material Recovery Chair (CRVMR).

Guillaume Majeau-Bettez is particularly interested in the environmental optimization of material recycling loops, in order to anticipate the challenges (accumulation of impurities, etc.) and the viable transition pathways toward a Circular Economy. His research also contributes significantly to the open life cycle assessment of Li-ion batteries and electric vehicles, as well as the optimization of their deployment as a climate change mitigation measure.

Guillaume is also Associate Adjunct Professor at the Industrial Ecology Programme (IndEcol) at the Norwegian University of Science and Technology (NTNU), where he originally completed both his masters and his doctorate. To facilitate the publication of open-source sustainability research software and open data, he serves as dedicated Associate Editor at the Journal of Industrial Ecology.


  • GCH1220 – Ecodesign and lifecycle analysis


Supervision at Polytechnique


  • Master's Thesis (2)

    • Muller, E. (2019). Estimation et complétion des flux élémentaires manquants du tableau entrées-sorties multirégional EXIOBASE (Master's Thesis, Polytechnique Montréal). Retrieved from
    • Ruiz, D. (2019). Optimisation environnementale de la production de vecteurs énergétiques à partir de matières résiduelles dans un contexte d’économie circulaire (Master's Thesis, Polytechnique Montréal). Retrieved from