Pollution of rivers by human Sweet Water is used on a daily basis by humans for drinking, cooking and washing out is very important because without it the Earth would not be living. Yes it is very remarkable that so little care of the people and it saves water. It is heavily polluted by various industrial plants, which collect fresh water, and Guadalajara dirty and often directly to the rivers. Near the hut to get the groundwater along with the rain of heavy metal oxides such as oxides of mercury, lead, zinc, cadmium and copper. Once you have joined them in the body not only human but also animals, they become very harmful. Damage the nervous system and gastrointestinal tract. These harmful substances accumulate in organisms and their dangerous activities until you can see several dozen or even dozens of years. Agriculture is also not indifferent to the environment. Many chemical pesticides and artificial fertilizers, together with the rain water flows into rivers. Their results in the so-called excess Zak, namely the massive development of algae and bacteria, which can give off toxins harmful to humans. Sometimes it is so that the power plants or collect cold water from the river to cool the furnaces and hot water release. Then the temperature of water in the river rises, which results in death, some species of fish.