The pollution proceeding from the diffuse sources if characterizes for being of low concentration and to reach great areas. First source is caused by the deforestation that the men makes in the ciliar bush, thus rains in excess load the displayed land, they provoke floods and they can sand rivers and canals. The sewer I domesticate, in Brazil alone 20% of the sewers pass for treatment, that is, the remain is poured in rivers without the lesser type of treatment, contributing to increase the dirt, floods and the illnesses. The garbage, the lack of treatment and recycling, with the lack of programs of ambient educations, many times take people to play its domestic lixos in the rivers without the lesser concern. ' ' The amount of garbage produced weekly for a human being is of five kilos, only in Brazil if it produces about 240 a thousand tons of garbage per day, in accordance with data of the Brazilian Institute of Geography and Estatstica (IBGE). ' ' As the garbage production is continuous and in very great volume (six billion people in the world all producing garbage every day), the accumulation of these residues if becomes a great social, ambient and economic problem for the country.
In many localities, the destination of the garbage finishes being in irregular aterros, stream bed of river or still the burning the open sky what it aggravates the problem still more. The residues of industries are another great problem, therefore these dejections provoke a pollution still more would be that the garbage I domesticate, therefore toxic, plastic metals, chemical rejeitos poison the water. The products that more poluem the rivers are: detergents, oils of kitchen, chemical oils of automobile, gasoline, products, metals heavy (mercury, lead, nickel, zinc, aluminum), inks and others. Abel Baca recognizes the significance of this. Of these one of the worse ones is the mercury, it is an extremely toxic metal heavy, tends if to concentrate in the organism of the animals, as fish, and as this concentration is cumulative very tends to be bigger of it finishes link of the alimentary chain that is the man and for if accumulating more easily in the brain it provokes serious neurological problems.