Search results
Results From The WOW.Com Content Network
It has been estimated that before European settlement, forests in the United States mainland covered nearly 1 billion acres (4,000,000 km 2). [1] Since the mid-1600s, about 300 million acres (1,200,000 km 2 ) of forest have been cleared, primarily for agriculture during the 19th century.
Conservation in the United States, history of activism before 1960 Forestry. List of national forests of the United States; History of the lumber industry in the United States; Timeline of history of environmentalism, on organized efforts; George Perkins Marsh Prize for best book in environmental history
Map of national forests and national grasslands of the United States. The United States has 154 protected areas known as national forests, covering 188,336,179 acres (762,169 km 2; 294,275 sq mi). [1] National forests are managed by the U.S. Forest Service, an agency of the U.S. Department of Agriculture. [2]
The Clean Air Act is passed in the United States, with subsequent amendments in 1970, 1977 and 1990. 1974 World population reached 4 billion. [23] 1970s 2010s Deindustrialization occurs in the Midwest and then much of the United States, as manufacturing industries (and their pollution) move to China and other Asian countries. 1980
The Appalachian temperate rainforest has a cool and mild climate and meets the criteria of temperate rainforests identified by Alaback. [1] Temperature and precipitation are extremely variable with elevation, with rainforest conditions usually but not always concentrated around spruce–fir forests at higher elevations.
In 1994 the national forests alone in Texas produced 93.8 million board feet (221,000 m 3) of timber, providing US$73.1 million (US$150 million in today's terms) in income and 2,098 jobs. [36] In 1992 the timber companies in the state produced more than 1,250 million board feet (2,900,000 m 3 ) and in 1997 they produced more than 1,370 million ...
One of the largest temperate rainforests in the world, Great Bear Rainforest covers a vast area the size of Ireland that’s rife with rugged beauty along its stunning fjords, coastline, and lush ...
Environmental History Timeline; Firstgov.gov – various United States government sites; The Evolution of the Conservation Movement, (1850–1920) — The Library of Congress; The Global Environmental Movement, John McCormick (London: John Wiley, 1995). American Earth: Environmental Writing Since Thoreau, Bill McKibben, ed; Al Gore, fwd., (New ...