1972 - Insecticide DDT banned
A worldwide ban of the insecticide DDT is issued as part of the Stockholm Convention on Persistent Organic Pollutants. Dichloro-diphenyl-trichloro-ethane was discovered by Swiss chemist Paul Hermann Müller in 1939 and used during WWII to mitigate the spread of malaria and typhoid (via insects). It was later used as an agricultural insecticide. In 1962, Rachel Carson published Silent Spring, detailing the ecological effects of widespread DDT use.
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