Theodore Roosevelt was a strong advocate for conservation and established several national parks and monuments during his presidency.

Yellowstone National Park was established in 1872 and is the oldest national park in the United States.

John Muir was a Scottish-American naturalist and conservationist who played a key role in the preservation of the redwood forests of California.

The National Environmental Policy Act (NEPA) was passed in 1970 and requires federal agencies to consider the environmental impact of their actions.

Aldo Leopold was an American forester and conservationist who is known for his book \"A Sand County Almanac\", which explored the ethical and ecological dimensions of conservation.

The Exxon Valdez oil spill occurred in 1989 when the Exxon Valdez oil tanker ran aground in Prince William Sound, Alaska, spilling millions of gallons of oil into the environment.

Rachel Carson was an American marine biologist and conservationist who is known for her book \"Silent Spring\", which raised awareness about the dangers of pesticides.

The Paris Agreement is an international treaty that aims to reduce greenhouse gas emissions and combat climate change.

Marjory Stoneman Douglas was an American journalist, conservationist, and environmental activist who played a key role in the preservation of the Everglades in Florida.

The U.S. Forest Service is the federal agency responsible for managing and protecting the nation's forests.

Rachel Carson was an American marine biologist and conservationist who is known for her work in preserving the Great Lakes.

The Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES) is an international treaty that aims to protect endangered species.

David Brower was an American conservationist and environmental activist who played a key role in the preservation of the Grand Canyon.

The U.S. Fish and Wildlife Service is the federal agency responsible for managing and protecting the nation's wildlife refuges.

Benton MacKaye was an American forester, conservationist, and regional planner who is known for his work in preserving the Appalachian Trail.