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Yosemite grant
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Yellowstone National Park founded
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US Geological Survey founded
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Forest Reserve Act
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Sierra Club founded in California
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National Park Protective Act
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National Park Service founded
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National Wildlife Federation founded
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DDT discovered
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Nature Conservancy founded
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First nuclear power plant
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Air Pollution Control Act
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Delaney Clause of Food, Drug, and Cosmetic Act
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"Silent Spring" published by Rachel Carlson
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Clean Air Act
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EPA Founded
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First Earth Day
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Clean Water Act
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Endangered Species Act
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Safe Drinking Water Act
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CITIES Act
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Resource Conservation and Recovery Act
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CERCLA Act
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Chernobyl nuclear disaster
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Montreal Protocol
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Exxon Valdez oil spill
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Kyoto Protocol
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Al Gore's "An Inconvenient Truth"