In this paper, the defects of System of Nationl Accounts (SNA) concerning environment and natural resources are indicated, empirical studies on natural resources depreciation calculation in SNA are introduced, and importance of interaction between environment and economics is discussed. Then, by presenting a Kynesian model, the green GNP s trend is shown. For accounting depreciation, Hart wick s adjustment at three levels (deplete able resources, renewable resources and pollutions) is presented. Finally, the practical methods to assess depreciation accounting for natural resources are discussed. Estimating the depreciation led us from conventional GNP to reach green GNP.
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