## 3 Results and Discussion  
Figure 4 and Table 2 illustrate the impacts obtained by IPCC-WGP-100 years for 1 kg of standard bricks produced from 100% natural clay and 1 kg of bricks produced with a 3, 7, and 10% by weight addition of olive pomace. The impact of the traditional system on global warming potential represents 260 kg CO\({}_{2}\) equivalent/tonne of bricks, a value comparable to those indicated by other authors such as [21; 22; 23; 24], showing values of 221, 271, and 195 kg CO\({}_{2}\) equivalent/tonne of bricks, respectively. However, bricks with olive pomace have been shown to be environmentally less sustainable, showing higher climate change impact values than the traditional system. The increase in climate change potential of bricks with 3% compared to bricks obtained by the traditional system is 19.2% (310 kg CO\({}_{2}\) equivalent/tonne of bricks), increasing to 44.2% and 63% for bricks with 7 and 10% of olive pomace, respectively. The bricks with 3% of olive pomace have proven to be more environmentally sustainable than the rest of the bricks tested with the addition of wastewater residue for the established time period of 100 years. Figure 5 shows the results obtained using the CML 2 baseline 2000 v2.05 methodology for a wider range of impact categories for traditional bricks. Figure 6 shows the impacts generated for the rest of the scenarios analyzed in this work in each of the ten selected environmental categories. Most of the impact, in all the scenarios tested, is attributable to the manufacturing phase, in particular the combustion of fossil fuels and the use of electricity during the firing process. The data on which these figures are based are shown in Table 3.  
Figure 4: Climate change potential, 100 years (kg CO\({}_{2}\) eq). Figure 5: Impact distribution for each of the stages analyzed in characterization in traditional bricks. Figure 6: Impact distribution for each of the stages analyzed in characterization for bricks with olive pomace (**a**) bricks with 3% ALP; **(b)** bricks with 7% ALP; and **(c)** bricks with 10% ALP. \begin{table}
\begin{tabular}{c c c c c c c c c c c c c c c c c c c} \multicolumn{13}{c}{**Run periods**} & \multicolumn{1 The manufacturing phase in the traditional system accounts for 90% of the \"Global Warning Potential\". Most of this impact (90%) is due, in particular, to the combustion of fossil fuels and the use of electricity during the firing process. The raw materials, extraction and transportation phases account for 3, 1, and 5%, respectively, for this impact category. The manufacturing phase is also the main cause of impact in all the other categories analyzed (between 51% and 86%). The manufacturing phase accounts for 92% of the \"Global Warning Potential\" for bricks with 3% of olive pomace, reaching 93% and 94% for bricks containing 7% and 10% of this waste, respectively, as shown in Figure 6. The environmental profile obtained for the bricks containing olive pomace is very similar to that observed for the traditional bricks, where most of the impact categories are dominated by the manufacturing phase, between 86% and 49% (Figure 6). Of all the stages evaluated, it is in the extraction stage where the environmental benefit produced by the addition of olive pomace to the mixture is the greatest, assuming, as shown in Figures 5 and 6, both in the traditional system and in the bricks with olive pomace, only 1% of the \"Global Warning Potential\". Extraction is also the most beneficial step in the \"Photochemical Oxidation\", \"Ozone Depletion\", \"Acidification\" and \"Abiotic Depletion\" categories, with values ranging from 1 to 3%. For the remaining categories (\"Ecotoxicity\", \"Human Toxicity\", and \"Eutrophication\"), the stage providing the greatest environmental benefit is that of raw materials, with values below 8%.