Environmental protection, quality requirements for products, eco –design of materials, increasing of production volume and market competition force the manufacturers to adapt to these requirements and also to economic issues. A mathematical method is applied to the solution of this problem. The individual factors of environmental and economic character are expressed by means of different equations having universal validity. The most important factor of the given ones is the so called natural capital, alias natural resources. They are derived from the environment. Each of summarized criterions is represented by its graphical form. An application to the automotive industry closes the paper.