Water treatment
We should separate sewage and other pollutants from teh water before releasing it back into the local water system.
(1) Primary treatment is the removal of suspended solids from teh water using a large sieve.
(2) Secondary treatments are mainly processes involving the use of natural biological processes during which 99% of solid waste is removed. Then the addition of special chemicals removes harmful chemicals and organic materials. In some places chlorine is added to the water to kill harmful bacteria. This is to ensure the water that remains is as pure as possible.
Only after these processes are completed is the water safe to release back into the environment.
Forest
A forest is a large area of land covered by trees and is home to many other types of plants together with some 85% of all the world's types of animals, including birds, insects, reptiles and mammals.