The purpose of this study is to make clear the source on the energy consumption and CO2 emission associate with building construction. In this study, two case studies provide following results.
1. The intensity of energy consumption and CO2 emission on the materials for building construction is decreasing from 1965 to 2000.
2. The input amount of materials for building construction is increasing for 1965 to 2000.
Therefore, the energy consumption and CO2 emission for building construction are not improving. To decrease the input amount is the effective way for improving the energy consumption and CO2 emission.
