The nutrient enrichment category aggregates all nutrient-enrich-ing emissions into No3-equivalents. In this category the two most important processes are replacement of virgin newspaper produc¬tion and emissions from the incineration process due to the food content of the waste. In Fig. 3 we can see that with a ±15% change in each component of the waste, the variation in outcome for Case 1 is between 16% more and 14% less savings, and in Case 2 between 6% more and 7% less savings than the reference scenario. Increasing the food content of the waste has the largest effect on this category because we get a combination of more impact from the incinerator due to more NOx-forming waste and because a 15% change in food content has a large impact on how much paper is recycled. The nutrient enrichment category should, given this large percentage change in impact, be seen as very sensitive to the percentage weight of food waste. However, the importance of this category for the total environmental impact of the waste management sys¬tem, after normalisation, is low.