816
Past emissions generated the static impacts, which are not attributed to any economic activity.
817
100% of the impacts dimensioned for GHG emitted during the period assessed with the GBS are attributed 818
to the emission source, as dynamic impacts.
819
5.3 Refined assessment
820
The refined climate change impacts on biodiversity can be computed in the GBS based on GHG emission 821
data. The possible data format (Scopes, perimeter…) are detailed in the GBS data collection guide (CDC 822
Biodiversité 2019a). For now, in the GBS, climate change impacts are counted only as dynamic impacts.
823
Figure 18 explains the computation process.
824
The GBS enables the computation of the biodiversity impacts of the following gases families: carbon dioxide 825
(CO2), fossil and biogenic methane (CH4), nitrous oxide (N2O), sulphur hexafluoride (SF6), 826
hydrofluorocarbons (HFCs) and perfulorocabons (PFCs). The time horizon is either 20 or 100 years.
827
The function ghg_get_emission_MSA_impact() converts a quantity of emitted GHG (in kg of GHG, no in kg 828
CO2-eq) to an MSA.area impact, by associating each GHG to its GWP (for CO2-eq conversion, they are 829
presented in Table 3) at a given time horizon and the corresponding MSA impact factor in MSA.km²/kg CO2 -830
eq. These factors are also used for default assessments. This function can be applied to different ranges of 831
GHG emissions values depending on the data uncertainties, and therefore lead to different results with the 832
central, optimistic or pessimistic calculation modesl.The used impact factors are in the data quality tier 1 as 833
they are based on international default values.
834
Two other functions are used in other GBS features but not directly for the refined assessment of climate 835
change:
836
- The function ghg_get_emission_kg_co2_eq() converts anemitted quantity of Greenhouse effect 837
gas (GHG) to a quantity of kg CO2-eq, thanks to the Global Warming Potentials (GWP) 838
presented in Table 3 consistent with the IPCC (Stocker 2014).
839
- The function ghg_get_emission_temperature_increase() converts an emitted quantity of GHG 840
(in CO2-eq) into a temperature increase in °C, by applying to the emission in CO2-eq the IAGTP 841
(Integrated absolute global mean temperature potential in °C/kg CO2-eq) for a time horizon of 842
20 or 100 years derived from (Joos et al. 2013) and dividing per number of years considered.
843
The principle is illustrated by Figure 16.
844
5.4 Limits and future development
845
For the refined climate change assessment, a function pressure_CC_evaluator() will be built to link and 846
integrate the features presented in this section to directly use corporate input data and assess dynamic 847
and static impacts.
848 849
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850
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Alkemade, Rob, Mark van Oorschot, Lera Miles, Christian Nellemann, Michel Bakkenes, and Ben ten Brink.
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Arets, Eric J.M.M., Caspar Verwer, and Rob Alkemade. 2014. ‘Meta-Analysis of the Effect of Global 857
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Benítez-López, Ana, Rob Alkemade, and Pita A. Verweij. 2010. ‘The Impacts of Roads and Other 859
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———. 2019a. ‘GBS Biodiversity Footprint Assessments Documentation: Data Collection Guidelines’.
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