## 2 Methodology
### Definition of the Objective and Scope of the Study
\begin{table}
\begin{tabular}{c c c c c c c} \hline
**Elementary How** & **Units** & **0\%** & **3\%** & **7\%** & **10\%** & **LCLA Dataset** \\ \hline Sheet rolling & kg & 0.000000157 & 0.000000157 & 0.000000157 & 0.000000157 & Sheet rolling, chromium steel [CICO] | market for iAloc Def, U \\ Steel, low-alloyed, hot rolled & kg & 0.00000306 & 0.00000306 & 0.00000306 & 0.0000306 & Steel, low-alloyed, hot rolled [CICO] | market for iAloc Def, U \\ \hline Sheet rolling, steel & kg & 0.0000157 & 0.0000157 & 0.0000157 & Sheet rolling, steel [CICO] | market for iAloc Def, U \\ \hline Polystyrene, expandable & kg & 0.000352 & 0.000352 & 0.000352 & 0.000352 & Polystyrene, expandable [CICO] | market for iAloc Def, U \\ \hline Electricity & kWh & 0.047971 & 0.033954 & 0.015265 & 0.001248 & Electricity, medium voltage [CICO] | market group for iAloc Def, U \\ \hline Nitrogen oxides & kg & 0.00026 & 0.00026 & 0.00026 & 0.00026 & Emissions to air—Nitrogen oxides \\ \hline Benzene & kg & 0.00002096 & 0.00002096 & 0.00002096 & 0.00002096 & Emissions to air—Remaze \\ \hline Sulfur dioxide & kg & 0.0000978 & 0.00009798 & 0.00009798 & 0.00009798 & Emissions to air—Solur dioxide \\ \hline Carbon monoxide, fossil & kg & 0.000391 & 0.000391 & 0.000391 & 0.000391 & Emissions to air—Carbon monoxide, fossil \\ \hline Particulates & kg & 0.000014 & 0.000014 & 0.000014 & 0.000014 & Emissions to air—Particulates, \(<\)25 um \\ \hline  & kg & 0.00000468 & 0.00000468 & 0.00000468 & 0.00000468 & Emissions to air—Particulates, \(>\)10 um \\ \hline Formaldehyde & kg & 0.0000164 & 0.0000164 & 0.0000164 & 0.0000164 & Emissions to air—Formaldehyde \\ \hline Hydrogen fluoride & kg & 0.0000106 & 0.0000106 & 0.0000106 & 0.0000106 & Emissions to air—Hydogen fluoride \\ \hline Water & m\({}^{3}\) & 0.00001512 & 0.0001512 & 0.00001512 & 0.00001512 & Emissions to air—Water/m\({}^{3}\) \\ \hline Hydrogen chloride & kg & 0.0000122 & 0.0000122 & 0.0000122 & 0.0000122 & Emissions to air—Hydogen chloride \\ \hline NMVOC & kg & 0.0000763 & 0.0000763 & 0.0000763 & 0.0000763 & Emissions to air—NMVOC, non-methane \\ \hline Carbon dioxide, fossil & kg & 0.18 & 0.2336 & 0.3051 & 0.3588 & Emissions to air—Carbon dioxide, fossil \\ \hline Phenol & kg & 0.00000013 & 0.0000013 & 0.0000013 & 0.0000013 & Emissions to air—Thenol \\ \hline Water & m\({}^{3}\) & 0.00008568 & 0.00008568 & 0.00008568 & 0.00008568 & Emissions to water—Water, RoW \\ \hline \end{tabular}
\end{table} 
Table 1: _Cent._Figure 3 illustrates in schematic form the production process of traditional bricks on the left and sustainable bricks using waste on the right. In this study, the system boundaries have been considered from raw material extraction to brick production. During the 'Extraction', 'Transport', and 'Manufacture' phases, a series of inputs and outputs of material and energy will occur, which are illustrated in the diagram and which, to a greater or lesser extent, will be shared by both processes. The differential stage will be the 'Manufacture' stage, where the exothermic power of the olive pomace used allows the energy cost to be reduced during the sintering process. Table 1 illustrates the inventory data for the 'Raw materials' phase. Table 1 lists the impacts associated with the extraction of natural clay, which are those related to the quarry operation, while the impacts attributable to the extraction of olive pomace are assigned to the main product of the olive oil extraction process and are not considered due to the residual nature of this material. The same table shows the inventory data for the 'Transport' phase of the raw materials to the mill. Emissions from the transport of the residue have been assimilated as the corresponding part of the clay it replaces. Figure 3: Life cycle flow chart of traditional bricks and bricks incorporating olive pomace in the different scenarios considered. 'Manufacturing' in Table 1 would be the last stage considered in this study.