Does the input include the output products from the previous process?

Question

Question 1: In the pre-processing stage of raw materials, my inputs are electricity, raw materials, etc., and the output is the pre-processed raw materials. In the next production stage, my inputs are the pre-processed raw materials (the output from the previous stage), electricity, etc., and the output is the final product. Do I need to include the pre-processed raw materials (the output from the previous stage) as inputs here? Would this result in duplicate calculations? Additionally (Question 2), under what circumstances should carbon dioxide (from the elementary flow) be included in the output process? For example, during the transportation process using a diesel-powered truck, my input is distance(unit is t*km). Should the emitted carbon dioxide be included in the output here? In the pre-processing stage, the input includes diesel required for machine operation(unit is MJ). Is there carbon dioxide in the output here? How should we determine whether it is direct or indirect emissions? I am eagerly awaiting the response from professionals

Answer 1

If I understand correctly: just model each step separately as it happens in reality (e.g. process a makes product a and emits pollutant a, process b makes product b and needs product a: let process a provide product a to process b with the amount needed by b), openLCA will then make the calculation and provide e.g. the amount of pollutant a that is emitted. Do not add the emissions yourself to the next process as this will indeed lead to double-counting.