Pesticide concentrations decreasing

The widespread use of pesticides across the United States has been in practice for decades, with little knowledge of the long-term effects on the nation's groundwater.

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<p><a href="http://www.physorg.com/news143725478.html">Pesticide concentrations decreasing</a></p> <p>The widespread use of pesticides across the United States has been in practice for decades, with little knowledge of the long-term effects on the nation's groundwater.</p>