Environmental Movement Growth in the 1970s

During the 1970s, the United States witnessed various environmental disasters that highlighted the need for stronger environmental protection laws.

In 1970, the first Earth Day was celebrated, marking a significant moment in the environmental movement. This event spurred increased public awareness and led to the establishment of notable environmental legislation. Among these was the National Environmental Policy Act (NEPA), which required federal agencies to assess the environmental impact of their proposed actions.

Which of the following events or developments is most directly connected to the growth of the environmental movement during this period?