The acidification category aggregates all emissions leading to acidification into SO2-equivalents. From Fig. 3 we can see that a ±15% change in each fraction of the waste give a variation in out-come for Case 1 of between 7% more and 6% less savings than in the reference scenario, and in Case 2 of between 2% more and 2% less savings. Changes in the percentage weight of paper and food are the most important. This is because these two fractions are the largest, and the amount of replaced virgin newspaper produc¬tion is the most important process for increasing the savings in im¬pact in this category. When the quantity of source-separated material is known (Case 2) there are small uncertainties connected to this category.