Provides information on US Congressman and life-long spokesman for the preservation and care of natural resources, George Perkins Marsh, who delivered a speech on agricultural conditions in New England on September 30, 1847. Also provides information on the world's first hydroelectric power plant, Appleton Edison Light Company, opened on September 30, 1882 in Appleton, Wisconsin. Includes links to documents and photographs about conservation, national parks, and Tennessee Valley Authority dams.