Edward Abbey
Edward Abbey was a 20th-century American environmentalist and a writer. His main focus was the desert and he wrote about its wonders and how it was being destroyed as society developed. Ansel Adams
Ansel Adams was a twentieth century photographer and conservationist. Not only did he become widely known in both areas, but he combined the two fields so that they each enhanced the other. John James Audubon
John James Audubon is one of the most acknowledged artists and naturalists in 19th-century America. He is most famous for his collection of
paintings of birds, The Birds of America. Hugh Hammond Bennet
Dr. Hugh Bennet was an American soil conservationist. Benet was one of the first scientists to recognize the process of soil erosion. Murray Bookchin
Murray Bookchin is a social critic, environmentalist, and writer. A self-described anarchist, he is often seen as the founder of "social
ecology." Norman E. Borlaug
Norman E. Borlaug is an American environmental activist. He is known as the father of the "green," or agricultural, revolution. Lester R. Brown
Lester R. Brown is an American agricultural economist and writer. He is also the founder and president of the Worldwatch Institute. John Burroughs
John Burroughs was an American naturalist. He is known for his writings -- articles, books, and poetry -- on the topic of the environment. Helen Caldicott
Helen Caldicott is an Australian physician, who is also both an antinuclear and environmental activist. Lynton Keith Caldwell
Lynton Keith Caldwell is an American scholar and environmentalist. He
views environmental protection as as much of the government's duty as is protection of freedom of speech. John Baird Callicott
John Baird Callicott is an American environmental philosopher. He pioneered the field now known as environmental ethics. Rachel Carson
Rachel Carson was an American biologist and popular author. She is most famous for her books;
Under the Sea Wind, The Sea Around Us, The Edge of the Sea, and, especially, Silent Spring. Barry Commoner
Barry Commoner is an American environmental scientist. He as also an author and a strong social activist. Douglas M. Costle
Douglas M. Costle is the former director of the Environmental Protection Agency (EPA). An educator and administrator, he was one of
the original designers of the EPA. Paul Ehrlich
Paul Ehrlich is an American ecologist and strong population control advocate. Dave Foreman
Dave Foreman is a radical American environmentalist. He is one of the founders of Earth First!, a group noted for consisting of ecological saboteurs, or ecoteurs. Lois Gibbs
Lois
Gibbs is an American environmentalist. She uses forceful and effective tactics to ensure the protection of communities dealing with toxic waste problems. Albert Gore, Jr.
Albert Gore, Jr., is the currently the Vice President of the United States as well as an avid environmentalist. Ernst Haeckel
Ernst Haeckel was a 19th-century German naturalist and liberal
non-conformist. Garrett Hardin
Garrett Hardin is an American ecologist, best known for his controversial beliefs about population control. Denis Hayes
Denis Hayes is an American environmentalist. He is famous for the role he played in founding and organizing Earth Day. Hazel Henderson
Hazel Henderson is a
leading environmental activist. She believes that unsustainable industry must end and that economic differences between individuals and groups are hurting the environment, as well as society. Wes Jackson
Wes Jackson is an American environmentalist. His main concerns are modern agriculture and the future problems that will result from careless agricultural practices. Aldo Leopold
Aldo Leopold was an early 20th-century American ecologist and environmental writer. James Ephraim Lovelock
James Ephraim Lovelock is a British chemist. He invented the electron capture gas chromatographic detector, which detects chloroflurocarbons in the atmosphere and can measure pesticides. Amory B. Lovins
Amory B. Lovins is an American physicist and
energy conservationist. His work has focused on the different capabilities of various alternative energy resources. George Perkins Marsh
George Perkins Marsh was a 19th-century American diplomat, author, lawyer, scholar, and congressman. Many have credited him with founding the science of ecology. Bill McKibben
Bill Mckibben is an American
environmentalist. He has written several influential books in the environmental field. Chico Mendes
Chico Mendes was a Brazilian environmental activist and union leader. He worked to keep tropical rain forests intact; he also worked for sustainable harvests that would protect these forests and the environment as a whole. John Muir
John Muir was a widely influential
19th-century American naturalist. He was instrumental in the wilderness preservation movement and in the move to create national parks. Ralph Nader
Ralph Nader is an American consumer advocate. He has worked on many different projects and founded many different organizations designed to help the American people and to protect the environment on the whole. Scott Nearing
Scott Nearing was an American conservationist. He is remembered as a writer, radical, and socialist, who was an inspiration to many important environmentalists. Henry Fairfield Osborn
Henry Fairfield Osborn was an American naturalist, notable for his involvement and contribution to many environmental organizations. Ruth Patrick
Ruth Patrick is an American
botanist who helped develop the field of limnology. Gifford Pinchot
Gifford Pinchot was an important American forester and conservationist around the turn of the century. John Wesley Powell
John Wesley Powell was a 19th-century American explorer and scientist. He contributed substantially to various fields of environmental science. William K. Reilly
William K. Reilly is an American conservationist and former head of the U.S. Environmental Protection Agency. Theodore Roosevelt
Theodore Roosevelt was a politician and conservationist. The 26th president of the United States, he used his position to pave the way for environmentalists of the future. Frank Sherwood Rowland
Frank Sherwood Rowland is an American chemist who has done groundbreaking work on ozone layer depletion. William Ruckleshaus
William Ruckleshaus is a former head of the U.S. Environmental Protection Agency. He is a lawyer who has been involved in many environmental issues and compromises. Kirkpatrick Sale
Kirkpatrick Sale is an American environmental writer whose work focuses on the effects of growing populations upon the environment. Paul B. Sears
Paul B. Sears was an American ecologist and conservationist. He was one of the first researchers in his area to study human ecology. Robert Angus Smith
Robert Angus Smith (1817-1884) was a 19th-century Scottish chemist
who investigated numerous environmental issues. Henry David Thoreau
Henry David Thoreau was a 19th-century American writer, philosopher, humanist, ecologist, naturalist, and conservationist. Russell Eroll Train
Russell Eroll Train is an American environmentalist. He was very influenced in making environmental issues a nationally recognized problem. William Vogt
William Vogt was an American ecologist and ornithologist. His work influenced many other fields of science. James Gaius Watt
James Gaius Watt is a former United States Secretary of the Interior. He took a highly controversial position on the issue of conservation. Gilbert White
Gilbert White
was an 18th-century English naturalist. His observations of nature were collected in a book which is now considered a classic of English literature. Edward Osborne Wilson
Edward Osborne Wilson is an American behavioral and evolutionary biologist. He is most famous for his in-depth studies of ants. George M. Woodwell
George M. Woodwell is an American
biologist. He has conducted research in numerous fields of both biology and ecology. | 
