Abstract
It was attempted to use life cycle assessment (LCA) to evaluate environmental impacts of an actual new habitation district, having a population of 9, 600 and an area of 162 hectares. Carbon dioxide (CO2) emission was chosen as a global environmental impact indicator. CO2 emission from land construction works of the district was estimated as 22 thousand ton-C by using combination of the input-output table method and the piling up method. CO2 emission from material accounted for nearly 60% of the total CO2 emission from the land construction works. Cement, concrete brick, and fresh concrete were major contributors to this fraction. CO2 emission from building works was estimated as 44 thousand ton-C. Total CO2 emission in the construction stage was estimated as 66 thousand ton-C. Annual CO2 emission in the operating stage was estimated as 6 thousand ton-C. With photovoltaic (PV) energy system, CO2 emission in the construction stage and operating stage will be reduced by 5% assuming 15-year period of use. In order to reduce CO2 emission from the urban district, it is important to include other urban activities, and to estimate CO2 emission from each cement product by the piling up method.
