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Mercury, dioxin, hexachlorobenzene and polycyclic aromatic hydrocarbons (PAH’s) are all persistent, bioaccumulative toxics (PBT’s) and therefore pose risks to human health and the environment. Hexachlorobenzene and PAH’s are probably carcinogens, according to the U.S. E.P.A. More information here.

This animation shows the chain of contamination in the human food supply.