Toxic wastes

The peculiar nature of human beings is that they change their environment to suit their biological and social needs. In this transaction they utilize the material necessities (resources) and produce worthless and sometimes harmful by-products. These by- products are termed as wastes and may be in the form of gases, liquids or solids. Direct or indirect exposure to toxic wastes and hazardous chemical agents has been implicated in numerous adverse effects on humans from cancer to birth defects. The old pollutants like lead, ____ _______ _____ ________ __________ _________ __________ _________ ___ ___.
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