Answer:
They restricted the use of the pesticide DDT
Step-by-step explanation:
The book Silent Spring written by Rachel Carson was published in 1962, and it documented the environmental effects caused by the indiscriminate use of pesticides. The publication of the book was a major step for environmental movement because the US Congress restricted the use of pesticide DDT because of it. Because of this, Silent Spring is known as the progenitor of the environmental movement.