Between 1961 and 1971 the United States dropped approximately 46 million litres of Agent Orange - a herbicide containing the highly toxic waste product dioxin - on South Vietnam. Some 20,000 villages were sprayed, affecting an estimated five million people.
In 1965 an official for the Dow Chemical Corporation wrote an internal memo in which he recognised that dioxin was “exceptionally toxic ... [with] tremendous potential for producing chloracne [a skin disorder similar to acne] and…