Question

The insecticide DDT was introduced in the 1950s, and the rates of malaria dropped significantly. DDT was later found to be toxic to birds and other animals, and it was discontinued in 1964.

As a result, rates of malaria began to rise. How can the effects of DDT on society be characterized?
only positive, not negative
only negative, not positive
both positive and negative
neither positive nor negative

Answer 1

both positive and negative

DDT reduced malaria and saved lives (positive) but caused environmental harm and wildlife deaths and led to later policy changes and malaria resurgence (negative).