EN
Some new ecological terms have recently madę a brilliant carrier, among which the concepts of the “sustainable use” of natural resources and “biological diversity” (biodiversity) are the most popular. Although very useful, both concepts, as every kind of tool, are often misunderstood or improperly applied, which may bring about serious harm to naturę and perhaps also to the long-term prosperity of humans. It is chiefly the lack of a commonly accepted interpretation of the relationship between the two fundamental concepts of Sustainable Development (SD) and Naturę Conservation (NC) that causes much confusion. These two forms of human activity are treated by extremists as mutually exclusive, although others perceive them as being compensatory or even partly complementary to each other in the long-term. Neither is there any agreement on to what extent NC constitutes part of sustainability: either the whole of its scope lies within activities promoting SD, or only a part of (active) conservation falls within its framework. Such unclear theoretical aspects, which have so far been overlooked, may result in inappropriate practical recommendations and wrong administrative decisions.Uncertainty of this sort does not help communication between people. It is especially confusing that there are several versions of both of these notions. As human influence on the State of environment usually has serious economic and ecological conseąuences, morę clarity on this point is vital.