How did Theodore Roosevelt work impact the environment?

Theodore Roosevelt significantly impacted the environment through his commitment to conservation, establishing the foundation for the modern American conservation movement. He created five national parks, 18 national monuments, and 150 national forests, protecting approximately 230 million acres of public land. Roosevelt also championed the Antiquities Act, allowing the president to designate national monuments, thus preserving important natural and cultural resources. His efforts laid the groundwork for future environmental protection and awareness in the United States.