- We can save water by setting limits.We don't have to use so much water.For that we set limits.We can prevent water pollution by dumping sewage into a little lake with no water life and not into the sea.Oil spillage can be poisoness,threatening and dangerous for water life.Particulate matter of chemicals and other substances do not dissolve.It settles at the bottom,harming other water life.This metal cause poisoning and affect health matters like numbness of the tongue,lips,limbs and blurred vision.Cadmium poisoning causes vomiting,headache and bronchial preumonia.