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DDT (Dichlorodiphenyltrichloroethane) was a chemical used as an insecticide and to control lice for years, mostly in the 1940s. However, around the 1970s, the U.S. government banned the use of DDT due to its harmful effects on the environment. However, by the ‘70s, DDT waste had already been dumped into the oceans because many just assumed no harm could be done. Over time, these caps rusted and broke open, causing this dangerous waste to seep into the oceans and, by extension, our water supply.