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In this paper, the I/O (Input-Output) Analysis method of LCA (Life Cycle Assessment) is compared with the Process Analysis method, in order to analyze differences between their performances such as CO2 emission intensities for iron steel products, plastics and energy. The new I/O Analysis method, where environmental loads of imported goods burdened in their export countries are added to environmental loads derived by I/O Analysis of the own country, is proposed. This I/O Analysis method derives values almost same or slightly different from values given by the Process Analysis method, for most materials on CO2 emissions on every life cycle stages. There are some exceptionally large differences between the CO2 emissions derived for some materials such as galvanized steel sheets by the two methods. The reasons, why the large and/or small differences would be occurred by the two methods, are also discussed.

Performance evaluation analysis for a Life Cycle Assessment Method based on Economic Input-Output Tables