**3. Adopted Approach**

LCA provides analysis of the environmental prospect and potential environmental impacts throughout life cycle of a product from raw material acquisition through production, use, end-of-life treatment, recycling and final disposal. Economic and social issues are outside the scope of the LCA. The ISO provides standards for the Life Cycle Assessment [33]. Figure 2 displays the approach of the analysis to the LCA framework complying with the ISO standards. It mainly consists of four steps: 'Goal and scope definition', 'Inventory analysis', 'Impact assessment' and 'Interpretation'. The workflow of case studies was assigned in the standardized format.

**Figure 2.** Methodology of Life Cycle Assessment.
