2015 年 11 巻 2 号 p. 114-120
Objective. The objective of this study is to evaluate the effect of a variation of the calculation of methods for category 11（use of sold products）of Scope 3 standard. In recent years, quantitative evaluation methods of GHG and other environmental impacts on the entire value chain of the organization, such as Scope 3 initiated by GHG protocol initiative, related ISO standards and environmental footprint of the organization proposed by EU, have been developed. Increasingly, more companies have disclosed the information on GHG emissions of the organization based on these methods. This study, by applying calculating GHG for supply chain of electronics, examines category 11 especially, focusing changes in the calculation results in different situation.
Results and Discussion. The impacts on the result were due to the difference in calculation methods and operation scenario. In addition, evaluation result is largely dependent on selection of database, especially different GHG emission factors of electricity.
Conclusions. This study showed that the calculation methods and database for electricity to be applied are the key aspects to be harmonized for comparison. Intended comparability among the same industry sector, which is discussed in EU’s Organization Environmental Footprint（OEF）, may be too idealistic in the current situation. More discussion is needed with sufficient samples toward standardization for comparative analysis.
