Higg MSI framework uses various widely accepted LCIA methodology to calculate midpoints for the impacts.
Higg MSI framework uses various widely accepted LCIA methodology to calculate midpoints for the impacts: Global Warming, Eutrophication, Depletion of Water, Resource Depletion and Chemistry.
LCIA method based
Intergovenmental Panel on Climate Change. 2013. IPCC Fifth Assessment Report. The Physical Science Basis. https://www.ipcc.ch/
IPCC 2013 GWP100a global warming potential (GWP) LCIA impact methodology. This is the most broadly accepted and up-to-date method to measure greenhouse gas emissions.
Eutrophication is the result of nutrient loading, and is measured in Nitrogen and Phosphorous equivalents. Each waterway will respond differently to different nutrient loads.
Center of Environmental Science of Leiden University (CML). 2013. CML-IA Baseline. http://www.cml.leiden/edu/software/data- cmlia.html
Depletion of Water :
Available WAter REmaining (AWARE)
more complex model, data for water use/ consumption is relevant at watershed spatially specific level, country level. Water availability varies over time and needs to be periodically updated in order to be accurate. Water availability is assessed at regionally specific levels. http://www.wulca-waterlca.org/
CLM, 2013 v4.2 Global. Energy use is a major driver of environmental impacts, and depletion of global resources is a widely recognized concern. assess the extraction and use of fossil fuel resources based on availability and access. Center of Environmental Science of Leiden University (CML). 2013. CML-IA Baseline. http://www.cml.leiden/edu/software/data- cmlia.html
Semi-quantitative impacts (Usetox) + qualitative modifiers.
Usetox (https://usetox.org/) & SAC Chemistry Task Team.
The precision of USEtox is low, and the toxicity of substances are not consistent enough, therefore Higg uses a semi-quantitative model, and take chemical qualifiers (certification/standard) into consideration