Contribution of the life cycle stages The contribution of the different life cycle stages of the 5-PC-ME door to the environmental impacts is presented in Figure 4.
100%
1. Raw materials 2. Production 3. Packaging 4. Distribution 5. Use 6. End-of-life
80%
60%
40%
20%
0%
Global warming Ozone depletion Figure 4 : Contribution of the life cycle stages to the environmental impacts - 5-PC-ME Acidification Eutrophication Smog
Raw material acquisition is responsible for more than 60% of the impacts for four (4) impact categories. End-of-life is responsible for more than 80% of the impact on eutrophication. The impacts on GWP presented here do not take into account the GWP credit due to carbon sequestration in wood products: only GHG emissions emitted during the product life cycle are represented here, which corresponds to an impact of 87.25 kg-eq CO 2 . Figure 5 presents the contribution of the different life cycle stages of the 5-PC-ME door to the energy consumption. Raw material acquisition is the most energy-consuming stage (>60%), no matter the energy source. Figure 6 shows that 65% of the energy demand for 5-PC-ME doors come from renewable sources. Finally, raw material acquisition is responsible for 87% of the whole life-cycle water intake, as shown per Figure 7 .
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