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we define a new term called “trees-containing index” like "calories", to measure how many trees each purchased wooden supply equals to ,from which people can directly realize that using wooden daily supplies is exactly consuming resources.
We also provide a way of “returning resources”-woee.The purpose of the system is to transfer the cognition of resources from “consuming” to “returning.” —Plant as many trees as you use.So in the system, people can create the resources that they consume. they also maintain the stable circulation of the ecological circle of the urban forest system.