The global climate change caused by excessive Greenhouse Gas (GHG) Emissions is posing a threat to human beings’ living environment and the public cost of this is generally known as well as accepted. In addition, as a scarce commodity, the right of GHG Emissions has been given the financial features by carbon emission trade, thus forming the emission prices and quantifiable assets. However, GHG Emissions is a kind of asset with its own limitation and prospective upper limit. It is globally recognised that the emission cap, determined by IPCC, refers to the atmospheric GHG concentration and total emission when the global temperature increase will not exceed 2℃ at the end of this century. Based on Natural Resource and Environmental Economics and Theory of Property, this dissertation defines the GHG Emissions theoretically, and systematically illustrates the scarcity, externalities and positive feedback effect. When it comes to the analytic method, by applying financial method and SRES scenarios analysis model to the environmental technical analysis, we establish a mixed mathematical model of atmospheric temperature-- GHG concentration--total emissions--emission reduction--the price of carbon emission right in combination with the status quo of carbon trade, which can effectively solve the interdisciplinary problem about the GHG emission control by discounting the full-cycle Emissions assets from present to the end of this century based on the global GHG emission cap. The research findings could contribute to the goal-setting of total emission reduction and sensible judgement about the price of carbon emission right.