Fig. 6 indicates the sensitivity of the environmental impacts by using different impact assessment methods and by using different recycling rates in the MRF process. At the end of first sensitivity analysis, it can be concluded that no significant changes were seen in results after the sensitivity analysis, which supports the reliability of our results. The second sensitivity analysis indicated that as the recycling rates of paper/cardboard, plastic, glass and metals range from 40% to 100%, environmental benefits from Alternative 5 will increase with an increasing recycling rate.