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Unformatted text preview: = 18600g CO2 + 20000g CO2+500000g CO2 =538600g CO2 equivalency 2 As evident from Table 2, the choice of time scale T plays a large role in the magnitude of the equivalency factor. For those gases with atmospheric lives significantly shorter than that of the reference gas CO2 , the equivalency factor decreases with an increase in T . The opposite is the case for those gases with significantly longer lives than CO2. In accordance with general LCA practice, the EDIP method recommends using a time scale of 100 years , but equivalency factors for 20 and 500 years are also given in the table in order to show the significance of T and to provide the option of alternative choices. 3...
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- Winter '11