Blog archive: September 2014

ISO system expansion = substitution

September 22, 2014 by Bo Weidema

When systems have more than one product, the ISO standards on LCA recommends avoiding partitioning/allocation of the system by instead “expanding the product system to include the additional functions related to the co-products” (ISO 14044, clause I am sometimes asked: “Is this ‘system expansion’ of ISO not something different from the ‘substitution’ approach (also sometimes described as the ‘avoided burden’ approach) used in consequential LCA?” This lack of clarity in the ISO standards is also sometimes lamented in the…

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