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The dodo goes extinct.
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Hanry David Thoreau was born.
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John Muir was born in Scotland.
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Thoreau publishes A Yankee In Canada.
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Thoreau publishes Walden.
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John went to the University of Wisconson to study sscience.
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Thoreau dies.
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He gave up his inventions to study nature
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Muir went to explore Yosemite National Park.
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John married Louie Wanda.
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Aldo Leopold was born in Burlington, Iowa.
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Congress passed legislation declaring Yosemite a National Park, thanks in large part to Muir’s advocacy.
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President Theodore Roosevelt visited Yosemite and was guided about by Muir. The two men camped under the stars in the Mariposa Grove of giant Sequoia trees, and their campfire conversation helped form Roosevelt's own plans for conserving American wilderness. The men also posed for an iconic photograph atop Glacier Point
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Rachel Carson was born.
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Assigned to district headquarters in Albuquerque in office of grazing.
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John Muir dies
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Helps found game protective associations throughout the Southwest, including the Albuquerque Game Protective Association, now known as the New Mexico Wildlife Federation.
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Accepts transfer to U.S. Forest Products Laboratory in Madison, Wisconsin as assistant director.
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Rachel Carson attends Pennsylvania College for Women.
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He accepts an invitation from Robert Marshall to become a founding member of The Wilderness Society.
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Leopold publishes A Sand County Almanac.
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Becomes chair of a new Department of Wildlife Management at the University of Wisconsin.
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Rachel Carson publishes a book called Under the Sea-wind.
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Aldo dies by a heart attack.
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Rachel Carson published The Sea Around Us.
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Carson wins National Book Award for Non-fiction for The Sea Around Us.
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The Edge of the Sea was published by Rachel Carson.
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Agent Orange is sprayed in Southeast Asia, exposing nearly 3 million American servicemen to dioxin, a probable carcinogen.
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Carson writes Silent Spring.
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Wilderness Act passed, which protects wild areas in the United States.
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Rachel Carson dies.
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Greenpeace founded.
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Environmental Protection Agency (EPA) created.
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First Earth Day celebrated.
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Ozone hole observed over Antarctica.
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Oil tanker Exxon Valdez runs aground in Prince William Sound, Alaska, spilling 11 million gallons of oil.
