Environmental act and how it has helped to ensure a safe environment in the United States

Select and briefly describe one environmental act and how it has helped to ensure a safe environment in the United States
At least 75 words

Describe the role of the U.S. Environmental Protection Agency (EPA) in policy formation and in protecting the environment
At least 75 words

Describe the importance of water and air quality to the environment and public health. What are the approaches used in relation to these issues?
At least 200 words

Describe some of the challenges faced in addressing environmental issues. Give some examples of actions that can be taken either by you personally or governing agencies to overcome these challenges.
At least 200 words