The practice and economic theory reveal relationships of dependence, between degree of reduction of pollutant residues, on the one hand, and the cost, as well as the total positive effects which is to be made by the control and the actions of reduction the degree of pollution, on the other hand....

Experts estimate that physical deterioration of the planet and environment, they stress more serious. The destruction of forests is accelerating and the deserts are extending. Soil erosion undermines not only agricultural production but also winning means needed of existence for millions of...