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A class of toxic chemicals known as persistent organic pollutants (POPs) are among the most dangerous compounds ever produced. They include industrial chemicals, byproducts of manufacturing processes and waste incineration, and pesticides that have been linked to devastating human health consequences. Despite their hazards, POPs continue to be produced, used and stored in many countries. Because they are long-lasting and travel long distances in global air and water currents, even POPs already banned in the United States, such as DDT and PCBs, still make their way into the U.S. food supply.