## 3 Results and Discussion
### Life Cycle Analysis
In the indicator marine eutrophication--MEP (acidification of the oceans), Figure 8b, a total of 3.332 and 2.197 kg N-Eq. was obtained for the case of traditional and non-traditional housing, respectively. Thus, a 52% difference in N (nitrogen) emissions resulted. Once again, clinker production is the process that stands out the most, representing a total of 18% (traditional housing) and 14% (non-traditional housing). On the other hand, industrial processes prevail in the generation of emissions of nitrogen oxides (NOx) and phosphorus  
Figure 8: (**a**) Processes involved in the environmental impact of the terrestrial acidification—TAP100 indicator; (**b**) processes involved in the environmental impact of the marine eutrophication—MEP indicator; (**c**) processes involved in the environmental impact of the photochemical oxidant formation—POFP indicator. (P), becoming the main component in the increase of the eutrophication index in the raw material production phase [40]. Results of 70.396 and 52.657 kg NMVOC-Eq. were obtained for the case of traditional and non-traditional housing, respectively, in the photochemical oxidant formation category--POFP (Formation of chemical oxidants), Figure 8c, with a difference of 34% in NMVOC emissions (volatile organic compounds without methane) between both construction methods. The use of fuel (diesel) and clinker production is the predominant activity in this category. Diesel contributes 23% (option 1) and 24% (option 2) in said impact, and clinker production contributes 22% (option 1) and 19% (option 2). To produce 1 ton of clinker, the main component of cement, 0.32 kg of diesel is used, and air emissions of 1.41 kg of nitrogen oxides and 0.077 kg of VOC (Volatile Organic Compounds) are generated [38]. Based on the results of a study conducted by the Residential Building Environmental Sustainability Observatory and the Autonomous University of Madrid [41], promoted by Via Celere, which is a real estate company dedicated to the development, investment, and management of residential assets, it has been estimated that for each square meter built-in residential buildings, 441 kg CO\({}_{2}\)-Eq. are generated. According to the above, the functional unit of study, which is a 42-m\({}^{2}\) house, should generate 18.522 kg CO\({}_{2}\)-Eq. This quantity is adjusted to the results obtained from the life cycle analysis for both houses that do not exceed 16.000 kg CO\({}_{2}\)-Eq. A study carried out by the Pontificia Universidad Catolica del Peru [42] shows that, of the life cycle stages analyzed (pre-use, use and end of life), the pre-use stage of a 130-m\({}^{2}\) single-family home of the area with traditional masonry (concrete blocks) is one of the most critical. According to this study, the pre-use stage represents 53.93% of the total (126.624 kg CO\({}_{2}\)-Eq) in terms of the generation of environmental loads, the use stage represents 43.28%, and finally, the end-of-life stage represents a percentage lower than 2.79%. It should be noted that the pre-use stage considers the phases of manufacturing materials and construction of the house, and that in the calculations, not only the gray work of the structure is considered, but also its finish (plasticer, paint, etc.). This shows that the most significant impact is due to industrial processes such as steel and cement production where high temperatures are used, and indicates the areas where efforts could be focused on improving their optimization. According to the results obtained, the climate change indicator or climate change turned out to be the one that contributes the greatest to the environmental impact because the manufacturing processes necessary for the manufacture of construction materials are those that predominate in the generation of emissions; among these processes are clinker production (cement industry), diesel consumption (cement and wood industry), and transportation (through distribution).