7. Conclusions
The significant findings from this study are:- In all four materials studied, the LCA phases that most clearly determine the final results are manufacturing and construction.For a three-levels building, in the manufacturing process, the embodied energy is between 38 and 51% of the total, and the CO2 emissions range from 44 to 72%. In the construction phase the embodied energy is between 25.5 and 31.8% and the CO2 emissions range from 16.5 to 32%.