DDT
DDT is an organochlorine insecticide that does not occur naturally. It is a persistent organic pollutant (POP) with a half life of 2–15 years. Concerns were raised about its use in the 1940s but the publication of Rachael Carson's book Silent Spring was the catalyst leading to DDT being banned. DDT was first banned in Hungary in 1968 then in Norway and Sweden in 1970, the US in 1972 and the United Kingdom in 1984.
Read more about this topic: DDT In New Zealand