2. Secondary data were obtained from the scientific literature and database srecognized at the international level: Ecoinvent (Frischknecht et al. 2005), US Life Cycle Inventory (U.S. Life CycleInventory Database 2012) and ELCD (http://lca.jrc.ec.europa.eu/lcainfohub). The life cycle stages defined in Fig. 2were fed into the model via parameter settings based on thecollected primary data. The independent and dependentparameters with regard to the reference product are given inTables