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Sustainable national income, (SNI) is an indicator for environmental sustainability, which gives an estimate of the production level at which - with the technology in the year of calculation - environmental functions remain available ‘for ever’. == Overview == The national income of a country is an estimate of the yearly production of goods and services. The loss of possible uses of the non-human made physical surroundings, named environmental functions, on which humanity is dependent in all its doings remains outside the estimate. Also the present and future production is dependent on these environmental functions. The sustainable national income (SNI) in a given year is an estimate of the production level at which - with the technology in the year of calculation - environmental functions remain available ‘for ever’. The sustainable national income (SNI) in a certain year is defined as: :''the maximum attainable production level whereby, with the available technology in the year of calculation, vital environmental functions remain available ‘for ever’.''〔Meanwhile also the OECD uses this definition: http://stats.oecd.org/glossary/detail.asp?ID=6587〕 The production level in the same year that is registered in the ''standard national income'' (NI) does not meet this condition. Environmental functions and their preservation after all fall outside the NI. The NI is therefore always higher than the SNI. The difference gives information about the distance between the present production level and the production level in a sustainable situation. If the distance decreases then we are on the road to environmental sustainability, the part of the production that is based on unsustainable use of the environment decreases. If the distance increases then we are drifting further away from sustainability. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Sustainable national income」の詳細全文を読む スポンサード リンク
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