2009 年 32 巻 4 号 p. 21-26
This study aims to determine the factors causing automobile CO2 emissions increase, and to make forecasts toward year 2020. Rapid aging and a sharp decrease in population are expected to reduce CO2 emissions in local city areas. However, analysing three factors, periodical, aging, and cohort, it is estimated that population will decrease, yet increased car dependency among elderly men and women across all age groups will lead to a increase of automobile CO2 emissions.