What were some early accomplishments of environmental activists?

- The establishment of the Sierra Club in 1892, one of the oldest and most influential environmental organizations in the United States.

- The passing of the National Park Service Organic Act in 1916, which established the National Park Service to protect and preserve national parks and other conservation areas.
- The passage of the Clean Air Act in 1963, which aimed to improve air quality and reduce pollution in the United States.
- The first Earth Day in 1970, which helped raise awareness about environmental issues and led to the creation of the Environmental Protection Agency.
- The banning of the pesticide DDT in the United States in 1972, due to its harmful effects on wildlife and the environment.