Three quotes:
1 According to Watersense (2008), “Using water efficiently in the house not only lowers the utility bill but also preserves the limited water resource for generations to come” (p.11).
2 Stolton and Dudley (2003) suggested that “It is widely assumed that forests help to maintain a constant supply of good-quality water because forests help to minimize soil erosion” (p.105).
3 There is a claim that “Certainly wastewater recycling will become an increasingly important source of new water in the coming decades in many areas” (Shiklomanov, 2000, p.25).