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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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1979 Three Mile Island (1979)
Three Mile Island Accident
The Three Mile Island Nuclear Generating Station. The plant was owned and operated by General Public Utilities and the Metropolitan Edison Co.
This was a partial meltdown of one of the pressurized water reactors in the plant that caused dangerous amounts of radioactive gas to enter the atmosphere. The water pumps that cool down the reactors failed and the backup pumps were shutdown due to maintenance. When a pressure relief valve was finally opened to relieve the tank of excess heat, it should of closed after all the pressure was relieved. It never did so water coolant flowed out. The heat from the reactor and radioactive coolant cause hydrogen gas to form which was thought to have caused a small explosion.
March 28, 1979
Dauphin County, Pennsylvania
An indicator inside the reactor had incorrect readings of the coolant level and the people working failed to realize what was really happening.
three mile island.doc
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