PVC, or polyvinyl chloride, has generated significant debates over recent years. Greenpeace has pressed for a ban on PVC production, because dioxins are created during the manufacture and incineration of the substance. Dioxins are one of the most dangerous human manufactured poisons, which also bioaccumulate in food chains. Also, the ingredients added to PVC can be toxic to users. The biggest producer of PVCs is China, where the production is relatively unregulated. However, PVC still persists today mostly for construction purposes, because of its durability, cost effectiveness, resistance to corrosion and versatility.