2004 Volume 29 Issue 93 Pages 31-36
It is said that the sum of CO_2 emission is due to building construction, public works and building operation which reaches to 42.4% of the total CO_2 emission in Japan, therefore CO_2 emission related to construction must be decreased. Intensity is defined the energy consumption (MJ) or CO_2 emission (kg-CO_2) due to the expenditure 1000yen. The energy intensity of building construction is 1000E/X, assuming that the construction cost is X yen and the embodied Energy of the building E(MJ). The intensity may also be considered as the value of environmental load divided by the social benefit. When the intensity of a commodity is less than the average, it is possible to decrease the domestic energy consumption in the market.
