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Intensities of energy consumption and CO_2 emission based on 2000 input/output table in Japan are calculated. These intensities include extension effect and fixed capital formation. The result shows that CO_2 emission from construction sector is 43% of total CO_2 emission in Japan. Next result shows that intensities of CO_2 emission of construction sector per floor area are almost same as those in 1995. Moreover, the breakdown of CO_2 emission of construction sector is investigated. The emission from cement production and transportation are accounted for large rate of whole emission due to construction. Finally, 'Eco Efficiency' is defined as construction cost per CO_2 emission (yen/kg-CO_2) for building assessment index.
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Yokoyama et al. (2005) studied this question.
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