This month, the water treatment department examines an alternative method of cleaning water as well as ways to conserve household supplies.
The report establishes that more than a third of the world's 105 biggest cities - including New York, Tokyo, Los Angeles, Nairobi and Melbourne - get much of their drinking water supply from protected forests. These forests, which reduce landslides, erosion and sedimentation, improve water quality by filtering pollutants like pesticides; in some cases, they even capture and store water.