The resource depletion impact category is an aggregation of the use of fossil fuels, metals and renewable resources. Use of gravel, sand, clay and limestone are not included. There are two important processes for the resource depletion impact category in this study: replacement of electricity production by the heat produced in the incinerator and the substitution of virgin aluminium production. The total resource depletion impact for the reference scenario is negative, indicating a net saving in resources. As we can see in Fig. 3, the scenarios with large amounts of waste with high heating value going to the incinerator and increased weight of metals to recycling will improve the system (paper low, plastic high, plastic low, food low, glass high and metal high). With a ±15% change in each component of the waste, the variation in outcome in Case 1 (constant sorting efficiency) is between 10% more and 3% less sav¬ings than the reference scenario, and in Case 2 (varying sorting effi¬ciency) between 3% more and 4% less savings. เท the Case 2 scenarios the quantities of waste going to the incinerator and the source-separated metals are known, and changes in waste compo¬sition is therefore of less importance to the total impact from the system.