Clean Air Act
1970 Clean Air Act passed, greatly expanding protection began by the Air Pollution Control Act of 1955 and the first Clean Air Act of 1963.
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Paul Lee
Feb 4, 20001 min
National Environmental Policy Act
1969 National Environmental Policy Act passed and Environmental Protection Agency created. In this, the first major U.S. environmental...
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Paul Lee
Feb 3, 20001 min
Santa Barbara Oil Spill
1969 Santa Barbara Oil Spill — Oil from Union Oil’s offshore wells fouled beaches in Southern California and aroused public anger against...
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Paul Lee
Feb 1, 20001 min
Grand Canyon
June, 1966 Sierra Club published full-page newspaper ads in the New York Times and Washington Post against building a dam that would...
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Paul Lee
Jan 31, 20001 min
Storm King Mountain
1965 The Sierra Club brought suit to protect New York’s Storm King Mountain from a power project. The case established a precedent,...
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Paul Lee
Jan 30, 20001 min
Wilderness Act
1964 The Wilderness Act passed, establishing a process for permanently protecting some lands from development.
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Paul Lee
Jan 29, 20001 min
Silent Spring
1962 Silent Spring by Rachel Carson published. The book alerted the general public to the dangers of pesticides, particularly the dangers...
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Paul Lee
Jan 28, 20001 min
Dinosaur National Monument
1955 As a result of public pressure, the federal government dropped plans for a dam in Dinosaur National Monument. Building on the...
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Paul Lee
Jan 27, 20001 min
David Brower
1952 David Brower became the first Executive Director of the Sierra Club. Under his leadership, the Club became America’s foremost...
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Paul Lee
Jan 26, 20001 min
Sand County Almanac
1949 Sand County Almanac by Aldo Leopold published posthumously.
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Paul Lee
Jan 25, 20001 min
Donora Zinc Works
October, 1948 An atmospheric inversion in Donora held the town under a cloud of gas from the Donora Zinc Works. Twenty people died....
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Paul Lee
Jan 24, 20001 min
Wilderness Society
January, 1945 The Wilderness Society was founded. In the first issue of their magazine Living Wilderness, editor Robert Sterling Yard ...
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Paul Lee
Jan 21, 20001 min
National Park Service
1916 National Park Service founded with Stephen Mather as President
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Paul Lee
Jan 20, 20001 min
John Muir Trail
1915 California legislature authorized $10,000 to start planning and construction of the John Muir Trail
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Paul Lee
Jan 19, 20001 min
Hetch Hetchy Valley
1913 Congress authorized the dam at Hetch Hetchy Valley in Yosemite National Park
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Paul Lee
Jan 18, 20001 min
Lakeview Gusher
March 15, 1910 The amazing Lakeview Gusher started spewing crude oil into the air of the San Joaquin Valley in California. Oil shot into...
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Paul Lee
Jan 18, 20001 min
Yosemite under Federal Control
1905 California legislature agreed to return Yosemite Valley to federal control
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Paul Lee
Jan 17, 20001 min
Teddy Roosevelt visits Yosemite
1903 Teddy Roosevelt visited Yosemite with Muir
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Paul Lee
Jan 16, 20001 min
Sierra Club outing
1901 First Sierra Club outing (to Tuolomne Meadows)
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