(32)Greenhouse gas emissions in the Union stemming from the water, sewerage, waste and remediation sector are relatively small. That sector nevertheless has a great potential to contribute to reduce greenhouse gas emissions in other sectors, particularly through the provision of secondary raw materials to replace virgin raw materials, through replacing fossil-based products, fertiliser and energy, and through the transport and permanent storage of captured carbon dioxide. Furthermore, activities involving anaerobic digestion as well as composting of separately collected bio-waste, which avoid landfilling of bio-waste are particularly important for reducing methane emissions. The technical screening criteria for waste activities should therefore recognise those activities as substantially contributing to climate change mitigation, provided that those activities apply certain best practices for that sector. Those technical screening criteria should also ensure that waste treatment options are in line with higher levels of the waste hierarchy. The technical screening criteria should recognise as substantially contributing to climate change mitigation those activities that process a uniformly set minimum share of sorted separately collected non-hazardous waste into secondary raw materials. However, it is not possible at this stage for technical screening criteria based on a uniformly set target for reprocessing waste to address fully the climate mitigation potential of individual material streams. It may therefore be necessary to further assess and review those technical screening criteria. The uniformly set target should be without prejudice to waste management targets addressed to Member States in Union legislation on waste. For activities related to water collection, treatment and supply as well as centralised waste water treatment systems, those technical screening criteria should take into account absolute performance and relative performance improvement targets in relation to energy consumption and alternative metrics, where relevant, such as leakage levels in water supply systems.