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The Kaya identity is an equation relating factors that determine the level of human impact on climate, in the form of emissions of the greenhouse gas carbon dioxide. This identity states that total emission level can be expressed as the product of four inputs: population, GDP per capita, energy use per unit of GDP, carbon emissions per unit of energy consumed. This equation is both very simple and tricky, as it can be reduced to only two terms, but it is developed so that the carbon emission calculation becomes easy, as per the available data, or generally in which format the data is available. The Kaya identity is a concrete form of the more general I = PAT equation. The latter seeks to describe environmental (I)mpact in terms of the factors (P)opulation, (A)ffluence and (T)echnology. In the Kaya identity, impact is carbon emissions, while technology is split into energy use per unit of GDP and carbon emissions per unit of energy consumed. == Overview == The Kaya identity was developed by Japanese energy economist Yoichi Kaya. It is the subject of his book ''Environment, Energy, and Economy: strategies for sustainability'' co-authored with Keiichi Yokobori as the output of the ''Conference on Global Environment, Energy, and Economic Development (1993 : Tokyo, Japan). Kaya identity is expressed in the form: : where: ''F'' is global CO2 emissions from human sources ''P'' is global population ''G'' is world GDP ''E'' is global energy consumption 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「Kaya identity」の詳細全文を読む スポンサード リンク
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