() development of weighting factors in the context of a canadian life cycle impact assessment method.

Soares, R1, 2, Toffoletto, L1, Deschenes, L1, 1 CIRAIG - Ecole Polytechnique, Montreal, Qc, Canada2 Universidade Federal de Santa Catarina, Florianopolis, SC, Brazil

ABSTRACT- Current Canadian LCA practices consist of practitioners using European or American methodologies when conducting comprehensive impact assessments, despite the fact that these may not be valid for Canadian conditions. In order to remedy this lack of suitable models, a site-dependant LCIA method is being developed. Weighting, one of the final steps in LCIA, ranks the impacts by comparing them to each other and allows the calculation of a single index as an integrated environmental impact. In order to facilitate the interpretation of future Canadian LCA studies, weighting factors were then developed. Since there is no consensus on which method should be used among the three commonly used groups of weighting methods (panel, monetary and distance-to-target), it was decided to develop a new method for the weighting phase of the Canadian LCIA method. This new method involves a multicriteria decision aid (MCDA) in a panel approach. The weighting factors of the ten impact categories are calculated according to a two-step procedure: 1) each impact category is scored (scale of 1 to 100, 100 being the most damageable) according to seven environmental criteria (influence of the impact on human health, on ecosystem health and on resource consumption, and scale, duration, reversibility and distance-to-target of the impact) by a panel of Canadian citizens; 2) each criteria importance is assessed with a resistance to change approach. Integrating these new weighting factors into the LCIA Canadian method will contribute to the progress of LCA in Canada.

Key words: mcda, lca, panel approach, weighting

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