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(W/MC273) Identification and weighting process of environmental problems for participatory decision-making ----framework and case study. Terazono, Atsushi1,2, Matsuhashi, Keisuke1, Moriguchi, Yuichi1, Yoshida, Sanae1, 1 2 ABSTRACT- Recently some life cycle impact assessment (LCIA) methodologies have been developed in the world. However, it is not clear yet who and how each environmental problem, which could be called impact category, should be identified and weighted for valuation process. We consider that it is important to provide the scientific information for decision makers such as public or local and governmental bodies, for helping their decisions when they select environmental alternatives. In order to develop the framework of valuation process that can easily be utilized by decision makers accompanied with their value judgments, we have held 4 workshops in Japan. At the first 2 workshops in 1997 and 1998, we gathered more than 25 environmental experts per an event, and listed 15 environmental problems and safeguard subjects. The list consist of global atmospheric change, hazardous / toxic chemicals and mass production / consumption / disposal and so on. Next, 31 citizens as well as 18 environmental experts participated in the third workshop in 1998, in order to reflect public value judgment on the weighting of valuation process and to compare the results between citizens and experts for weighting various problems. To make the list with weighting factors generally acceptable, (1) presentation of scientific information by experts, (2) discussion among experts and citizens, (3) instant delphi method, were adopted. Citizens and experts evaluated environmental problems through pair-wise comparison answer sheet. There were fewer differences between the weighting factors by citizens and those by experts than we had expected, though there was some differences among individuals. Through the third deliberative workshop, we confirmed the validity of the valuation process with citizens. The dataset of weighting factors might be used as generic valuation factor in LCIA, after the participants and the LCIA user agree with these values. Finally, we held forth, which is first case study, workshop in 2000 for the selection of milk containers in schools. The result of this case study suggests that the dataset of generic weighting factors for environmental problems could be applicable for decision-making in some case studies. Key words: Valuation process, Environmental problems, Weighting, Workshop |
