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The standard reference is The Deciduous Forest of Eastern North America. [4] The adjoining forests in Canada are generally referred to as the Mixedwood Plains Ecozone or the Great Lakes-St.Lawrence Forest Region. 32 Texas Blackland Prairies; 33 East Central Texas Plains; 34 Western Gulf Coastal Plain; 36 Ouachita Mountains; 37 Arkansas Valley
U.S. Census Bureau regions and divisions. Since 1950, the United States Census Bureau defines four statistical regions, with nine divisions. [1] [2] The Census Bureau region definition is "widely used... for data collection and analysis", [3] and is the most commonly used classification system.
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The Environmental Protection Agency (EPA) is an independent agency of the United States government tasked with environmental protection matters. [2] President Richard Nixon proposed the establishment of EPA on July 9, 1970; it began operation on December 2, 1970, after Nixon signed an executive order. [3]
The commission's 1997 report, Ecological Regions of North America, provides a framework that may be used by government agencies, non-governmental organizations, and academic researchers as a basis for risk analysis, resource management, and environmental study of the continent's ecosystems. [1]
Average temperatures in almost all regions in the U.S. have increased in the last 120 years. [6] Annual temperatures averaged across the U.S. have exceeded the 1971–2000 average almost every year in the 21st century. [7] Climate change has led to the United States warming by 2.6 °F (1.4 °C) since 1970. [8]
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2009-11-05T19:39:42Z NuclearVacuum 959x593 (88399 Bytes) Fixed up the borders so they are connected with each state and loosing that gap between them. 2008-10-09T16:36:40Z Howcheng 959x593 (80121 Bytes) Reverted to version as of 08:32, 14 June 2007