“…Here, a FU can be referred to as 1 ha of olive orchard (Bernardi et al, 2018;De Luca et al, 2018;Mohamad et al, 2014;Proietti et al, 2016Proietti et al, , 2014Rajaeifar et al, 2014), as mass unit such 1 kg of harvested product (Bernardi et al, 2018) or 1 ton of olives (Romero-Gámez et al, 2017;Salomone and Ioppolo, 2012), since the main objective of agricultural systems is food production (Romero-Gámez et al, 2017). Furthermore, for life cycle assessment focused on the waste treatment of olive mills, mass units were used, such 1 ton of olive solid waste (El Hanandeh, 2015), 1 ton of olive husk (Christoforou and Fokaides, 2016) and 100 kg of olive pomace (Parascanu et al, 2018a).…”