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Characterisation Method Information
Characterisation Method Name:
CO2 impact on NEX
Date Completed:
Principal Method Name:
EPS: global warming
Method Description:
NEX is Normalised EXtinction of species.


The characterisation factor is determined by an empirical method.

A review of the current state of knowledge on Biodiversity and global climate change was made by van Vuuren and Kapelle (1998). The threat to bio-diversity lies mainly in
the alteration of habitats for species that has no possibility to adapt to the moving climate zones. No quantitative estimation of the impact on bio-diversity from global warming has been found.

However, as it is regarded as one of the most serious threats, omitting it would also be a quantitative estimation in this priority setting context. It is assumed therefore until better knowledge is available that the present rate of extinction will be doubled, i.e. the total
indicator value change is 1 NEX per year or 100 NEX in the environmental system considered. This assumption has little or no base in real experience, and should be regarded as a first guess and basis for improvement.

The characterisation factor is thus equal to 100* 1.26×E–16 = 1.26E–14 NEX/kg CO2.
Literature Reference:
Van Vuuren, M. and Kappelle, M., “Biodiversity and Global Change”, report Nr 410 200 014, Hortus Botanicus, Leiden University.
Methodological Range:
The impact is of global character. The modelled system is therefore global. The choice of temporal system borders may be made in several ways. In terms of endpoint impact duration, extinct species are extinct forever. In terms of system response time it is more relevant to use 100 years as temporal system borders. 100 years is the times scale necessary to establish a forest or a soil structure. It may vary between northern and southern latitudes and with the criteria’s used to categorise a biotope, but a 100 years time period is not an unreasonable temporal system border for the category indicator used as default, i.e. contribution to the red-list. It is also practical as it is used for the other impacts caused by CO2.

Existing Characterisation Factors of CO2 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 = *
CO2 1.26E-14 NEX/kg Global warming