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Characterisation Method Information
Characterisation Method Name:
Ethylene impact on NEX
Date Completed:
Principal Method Name:
EPS: equivalency method modelling on global warming
Method Description:
NEX is Normalised EXtinction of species.


The characterisation factor is determined by an equivalency method using CO2 as a reference.

Equivalency factor

The GWP100 was estimated by IPCC(Intergovernmental Panel on Climate Change)to 11 in one of the early reports. (1990). Later this statement was withdrawn by IPCC, with the motivation that the uncertainty was too large. In the EPS context however, omitting it would create a larger error than including it, so the equivalency factor 11 will still be used.

Calculation of characterisation factor

The characterisation factor of CO2 for NEX is 1.26E14 per kg CO2 "CO2 impact on NEX". Thus the characterisation factor of NEX is 11*(1.26E14 ) = 1.39E13 NEX per kg ethylene.
Literature Reference:
Steen B (1999b): A systematic approach to environmental priority strategies in product development (EPS). Version 2000 Models and data of the default method CPM report Chalmers University of Technology Sweden
Methodological Range:
The pathway modelled is via global warming. The same system borders as for CO2 is used i.e. 100 years.

Existing Characterisation Factors of Ethylene impact on NEX
Characterisation Parameter Category Indicator Impact Indication Principle Aspect Substance Quantity Unit Notes
CFactor NEX EPS/2000
Type = Emission
Direction = Output
Media = Air
Geography = *
Ethylene 1.39E-13 NEX/kg Global warming