Finite, Resource that will run out (e.g crude oil), Renewable, Resource that can be replenished (e.g wood), Potable water, Water that is safe for humans to drink, Desalination, Removal of salts from water to make it potable, Screening, Removal of large solids (first step of sewage treatment), Sedimentation, Settling of small insoluble particles in water (second stage of sewage treatment), Anaerobic digestion, Using anaerobic bacteria to digest sludge, Sterilisation, Use of UV light, chlorine or ozone to kill microorganisms, Sludge and effluent, Leftover solid (sludge) and liquid (effluent) after sedimentation, Life cycle assessment, Analysis of the impact of a manufactured product on the environment

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