Maintain the necessary natural resources and rare with caution, as well as useful and functional in increasing both the physical and economic as possible. As well as the need to recognize that The resources required to maintain as a substitute. With production rate equals the rate or rate equal to the death rate for backpack through at least
. A new method for improving the town and in the production and use of natural resources efficiently. As well as trying new things to research substitute
. To sue people to check understanding of the importance in maintaining natural resources.
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