The man is shaped by nature and hence he is organically tied to it. He will develop properly both physically and psychically, when there is harmony and balance in nature. All the symptoms of destroying this balance lead to disturbances in our organisms’, resulting in pathological changes — diseases as well as harmful and irreversible changes in our environment. And this is why recently more attention has been paid to ecology — the knowledge of the natural economics, of the interdependences (...) between organisms as well as between organisms and the environment, so that the values suggested by ecologists could become basic assumptions in economy.The necessity of ecological research in the environment protection has been seen in various levels of the biosphere organisation, i.e. on the levels of organism, population, biocoenosis and ecosystem.The first sign of understanding these difficult and complicated arrangements in nature is the infiltration of the ecological thought into other branches of knowledge, like medicine man’s health in connection with its ecological conditionongs, agriculture (rational productivity of agrocoenoses), forestry (biological fight against pests) etc. (shrink)