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George Perkins Marsh questioned the idea that America’s Resources were inexhaustible

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George Perkins Marsh questioned the idea that America’s Resources were inexhaustible

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1864

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John Muir is largely responsible for establishing Yosemite National Park

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John Muir is largely responsible for establishing Yosemite National Park

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1964

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Aldo Leopold’s book A Sand County Almanac laid groundwork for the field of environmental ethics

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Aldo Leopold’s book A Sand County Almanac laid groundwork for the field of environmental ethics

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1949

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Largest Oil Spill at the time took place off the coast of California in the Santa Barbara Channel.  (Today it’s the worst in California history and 3rd worst in US history)

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Largest Oil Spill at the time took place off the coast of California in the Santa Barbara Channel.  (Today it’s the worst in California history and 3rd worst in US history)

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1969

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Backlash against environmental laws and regulations led by some corporate leaders and members of congress

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Backlash against environmental laws and regulations led by some corporate leaders and members of congress

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1980s

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Environmental leaders and supporters have spent much of their time fighting the efforts to discredit the environmental movement

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Environmental leaders and supporters have spent much of their time fighting the efforts to discredit the environmental movement

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1890

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Theodore Roosevelt’s time in office is often called the “Golden Age of Conservation”.  He established 50 National Parks and tripled the size of national forest reserves

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Theodore Roosevelt’s time in office is often called the “Golden Age of Conservation”.  He established 50 National Parks and tripled the size of national forest reserves

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1901-1909

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Rachel Carlson’s book,  A Silent Spring, documented pollution of air, water, and wildlife through the widespread use of harmful pesticides such as DDT

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Rachel Carlson’s book,  A Silent Spring, documented pollution of air, water, and wildlife through the widespread use of harmful pesticides such as DDT

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1962

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1970

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Environmental leaders and supporters have spent much of their time fighting the efforts to discredit the environmental movement

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Environmental leaders and supporters have spent much of their time fighting the efforts to discredit the environmental movement

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1990s

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1892

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Aldo Leopold helped found the U.S. Wilderness Society

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Aldo Leopold helped found the U.S. Wilderness Society

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1935

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U.S. undergoes rapid economic growth and industrialization

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U.S. undergoes rapid economic growth and industrialization

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1940-1970

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1970s

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1990-Present