CS follows the precautionary principle, avoid product or processes whose environmental and human health effects are disputed or unknown. PVC contains additives - vinyl chloride monomers, halogenated/brominated fire retardants, plasticizers and other materials - that have all been proven to be harmful at some point along their lifecycle. The environmental concerns of PVC have led numerous organizations and authorities in the US and European countries to discourage or ban its use. Dioxin, a PBT toxin that can be emitted during manufacturing and disposal of PVC, is among the top offenders on EPA’s list of toxic chemicals.