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years have the bird populations effected by the chemical begun to increase.  DDT is still used as an agricultural chemical in many other countries.  Some of the birds migrate to these countries.

We must make every effort to determine possible danger to our world before using any pesticide (chemical compound designed to destroy pests) such as an insecticide (chemical to destroy insects), herbicide (chemical to destroy weeds) fungicide (chemical to destroy molds), or rodenticide (chemical to destroy rats and mice).

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