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Why are there no characteristic factors for product flows and waste flows in the input-output module of the system process in the EF3.1 and ELCD3.2 databases
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Hi, I think you mean characterisation factors - this is common for almost all LCA databases, only elementary flows have characterisation factors since only these go to nature or come from nature. There are only a few exceptions, for example the "proxy inventory" indicators in EPDs (exported energy, secondary material, hazardous waste, etc.).
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