Town Hall Seattle Science Series

In the 1940s, the insecticide DDT was widely used to combat insect-borne human diseases like malaria and control insects in agricultural applications, gardens, and inside homes. In the 1950s, it became evident that the pesticide was causing extensive health and environmental damage. In 1962, Rachel Carson’s book Silent Spring alerted the public to the long-lasting dangers of pesticide use. And in 1972, the United States EPA issued an order for DDT’s cancellation due to adverse environmental effects and human health risks; in the years that followed, dozens of other countries followed suit. The process took decades, and continues to evolve as DDT remains in use for malaria control today. Historian Elena Conis traced the history of DDT in How to Sell a Poison: The Rise, Fall, and Toxic Return of DDT, following a trail of corporate manipulation and manufactured doubt in science geared to keep the profits flowing. Using the story of DDT as a cautionary tale, Conis argued that we need new ways to communicate abou