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1780s Thomas Malthus
1890 U.S. Government declares frontier closed
1891 Forest Reserve Act (1891)
1892 John Muir (1892), preservationist
1892 Sierra Club
1900 Lacey Act (1900)
1900-1909 Theodore “Teddy” Roosevelt (early 1901-1909 The Golden Age of Conservation)
1902 Reclamation Act (1902)
1905 Audobon Society, founding of (1905)
1905 Gifford Pinchot (1905)
1906 Antiquities Act (1906)
1908 Svante Arhenius (1908)
1910 Alice Hamilton (1910?)
1916 Woodrow Wilson and National Park Service Act (1916)
1918 Migratory Bird Treaty Act (1918)
1930s Franklin D. Roosevelt (early 1930s stuff … think history class!)
1933 Civilian Conservation Corps (1933)
1933 Tennessee Valley Authority (1933?)
1934 Dust Bowl begins in Midwest (1934)
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1948 Donora, PA (1948)
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1948 Donora Smog
Donora, Pennsylvania is a mill town 24 miles southeast of Pittsburgh on the Monongahela River.
The Donora Smog was an air inversion which trapped ind
ustrial pollutants in the air for 6 days
An inversion occurs when the ground air is cooler than the air above it (reversed conditions in the atmosphere) and when this happens man made pollutants are trapped in the air, causing smog.
It killed 20 people and permanently damaged the lungs of 7,000
and the event raised public awareness that air pollution can be lethal and cause serious damage to one’s health.
The source of the pollution was from the
U.S. Steel smelting plants and Donora Zinc Works
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