Which pesticide was once widely used but is now banned in the United States?

Which pesticide was once widely used but is now banned in the United States?

• A. Malathion
• B. Aldicarb
• C. DDT
• D. Chlordane

Answer: (C)

DDT, or dichlorodiphenyltrichloroethane, was a pesticide that gained popularity after World War II due to its effectiveness in controlling a wide range of pests, including mosquitoes that spread malaria. However, over time, scientific research revealed that DDT posed significant environmental and health risks. It was found to be highly persistent in the environment, bioaccumulating in the food chain and leading to declines in certain wildlife populations, particularly birds. The detrimental effects on the environment, combined with concerns over potential impacts on human health, led to increased regulatory scrutiny.

In response to these concerns, the United States banned the agricultural use of DDT in 1972. This pivotal decision was influenced by the environmental movement, particularly highlighted by Rachel Carson's book "Silent Spring," which documented the negative effects of pesticides on the environment. The ban on DDT is an important example of how scientific research can inform public policy and lead to changes that protect both human health and the environment.

In comparison, while malathion, aldicarb, and chlordane have restrictions or are regulated, they have not been completely banned in the same way DDT has in the United States. This history highlights the evolving understanding of pesticides and the