of extremely toxic
aromatic halogenated hydrocarbon
(chemical name 'dibenzo-p-dioxins') which are byproducts of burning polyvinyl chloride (PVC)
plastic and manufacture
, certain herbicides, and military exfoliants. Being environmentally stable
, dioxins can persist in nature (see Bioaccumulation) to enter food chains, and are known to cause kidney and liver cancers and still-births.