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All wastes, as the products of human activity, necessarily enter matte r cycles in nature and ecosystems after certain time. They can damage the nature by their direct effects on biotic and abiotic ecosystems. Our contributio n discusses the risk properties of wastes and their influences on the environment with respect to the protec tion of public health. The hazard effects of wastes are demonstr ated using some cases of their direct exposition on organisms and other parts of the environment.