## 3 Results
Then, in order to identify the most impacting components on the final assessment, for each product, the various contributions should be analyzed in deeper detail. In Figures 5-8, the different contributions to the final indicators for climate change, human and water toxicity, and water depletion are respectively shown. The different contributions have been grouped in seven macro-items: raw materials, transport, electricity, heat production, building facilities, fossil fuel, and other processes. The last item incorporates the marginal contributions, lower than 1%, to the impact category. As far as the climate change indicator is concerned, the raw materials preparation has the highest contribution in cob products and wood pellets. They have a positive contribution in the processes and are responsible for the negative value of this midpoint indicator. On the contrary, for the silicon carbide production, the raw materials have a marginal contribution. Another consistent contribution is the electricity consumption that proved to be relevant in all four cases. The electricity consumption covers 58% of the climate change impact of the silicon carbide production. On the contrary, for the other products, it exhibits a limited impact. It can be noticed that the cob grits has a slightly higher electricity consumption compared to the cob pellet. Transportation has a small but visible impact on the cob process. On the contrary, it has a more noticeable contribution in the other two production processes. This assertion can be assumed analyzing the fossil fuel category that, for the reference products, groups all the processes/actions involving fossil fuel consumption. In fact, considering the low amount of fuel used for machine operation during the processing phase of WP and SC, fossil fuels consumption is mainly attributable to the transportation processes. Waste disposal and heat production are two specific contributions of silicon carbide and wood pellet processes, respectively. The first has a marginal participation (1%) on this impact category; on the contrary, the heat production has a remarkable role (35%) on the climate change indicator. Moreover, in case (c) in Figure 5, several smaller contributions, grouped under \"Others\", impact for the 33% on the total kg CO\({}_{2}\) eq. The contributions in the water ecotoxicity impacts, in Figure 6, are similar for the two cob based materials. However, compared to Figure 5, the building facilities' contributions have the highest percentages, 48% for the cob grits and 43% for the cob pellet. These contributions involve construction and maintenance of the facilities considered in the models. The same contribution is present in the wood pellet production for 16%. Similar magnitudes characterize the raw materials' voice. The main contribution (equal to 92%) of the silicon carbide process is due to electricity consumption and the others can be considered marginal, since their percentages are lower than 4%. Transportation has the same contributions to both cob valorization processes, circa 5%. Differently, the electricity consumption has a higher contribution (14%) in cob pellet production compared to cob grits production (7%). The electricity consumption has a similar magnitude on the wood pellet production. In the water ecotoxicity assessment, the contributions of waste disposal and heat production, in silicon carbide production and wood pellet production respectively, are analogous to the climate change assessment. The results related to the contributions in the water ecotoxicity impact, shown in Figure 6, are analogous in terms of magnitudes to the human toxicity assessment. Differently, the water depletion impact is characterized by similar magnitude contributions for cases (a) and (b), with more than 90% attributed to raw material preparation and supply and energy consumption. The contributions of transportation and other processes are negligible. An important role of raw materials is noted in case (d) where the main impact is due to the electricity consumption (57%).