Abstract
By the Entry into forth of the Kyoto Protocol, reduction of CO2 discharge became a big social duty in a citizen and activity of a company. Quantitative recognition for adischarge and fixation is necessary to achieve this aim. In this paper, Environmental Capacity of CO2 fixation of River Basin was calculated on the Three Metropolitan Areas in Japan by using GIS. Environmental Capacity of CO2 fixation set it as quantitative relation of CO2 fixation and CO2 discharge. And, fluctuation of Environmental Capacity of CO2 fixation was calculated in Lake Biwa- Yodo River basin and Yamato River basin.
