Recently, the importance of environmental impact assessment (ETA) has increased significantly. It may be essential for human survival, providing future generations with sustainable development. Although the ETA system was legalized to improve the previous one this June, many problems for predicting the influences to living things have still remained. In this report, we suggest a way of predicting influences to the wild birds situated higher in the ecosystem, requiring the use of new evaluating methods for assessing regular circulation. From the perspective of preserving ecosystems, we tried to measure the change of secondary influences of the wild birds' feeding circumstances which they absolutely need for their survival. Therefore, we have presented a method for evaluating the influences quantitatively. When used along with the predictive measures described in the previous report, we can now evaluate the primary influences from human development. Our method, which differs from others, can describe the change of wild birds' inhabiting conditions quantitatively using both ways of prediction, and can provide useful information for the planning or mitigation of development.
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