Land, Public and Private

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Presentation transcript:

Land, Public and Private Chapter 10 Land, Public and Private

Module 29 Land Use Concepts and Classification After reading this module, you should be able to Explain how human land use affects the environment. Describe the various categories of public land used globally and in the United States.

Human land use affects the environment in many ways Every human use of land alters it in some way.  People do not always agree on land use and management priorities. To understand land use and management issues, environmental scientists use 3 concepts: Tragedy of the commons Externalities Maximum sustainable yield

Tragedy of the Commons Tragedy of the commons The tendency of a shared, limited resource to become depleted because people act from self-interest for short-term gain. When many people share a common resource without agreement on or regulation of its use, it is likely to become overused very quickly.

Tragedy of the Commons The tragedy of the commons. If the use of common land is not regulated in some way—by the users or by a government agency—the land can easily be degraded to the point at which it can no longer support that use.

Externalities Externality The cost or benefit of a good or service that is not included in the purchase price of that good or service. Environmental scientists are concerned about negative externalities because of the environmental damage for which no one bears the cost.

Maximum Sustainable Yield Maximum sustainable yield (MSY) The maximum amount of a renewable resource that can be harvested without compromising the future availability of that resource. Maximum sustainable yield varies case by case. In theory, harvesting the MSY should be sustainable. In reality it is very difficult to calculate MSY. Even when we do calculate MSY, it can take months or years to determine whether a yield is truly sustainable.

Maximum Sustainable Yield Maximum sustainable yield. Every population has a point at which a maximum number of individuals can be harvested sustainably. That point is often reached when the population size is about one-half the carrying capacity.

Public lands are classified according to their use Protected land and marine areas of the world. Protected areas are distributed around the globe.

International Categories of Public Lands The United Nations recognizes six categories of public lands: National parks are managed for scientific, educational, and recreational use, and sometimes for their beauty or unique landforms. Managed Resource Protected Areas are designated for the sustained use of biological, mineral, and recreational resources. Habitat/Species Management Areas are actively managed to maintain biological communities. Fix spacing and size so the next slide and this match.

International Categories of Public Lands (Cont.) Strict Nature Reserves and Wilderness Areas are set aside to protect species and ecosystems. Protected Landscapes and Seascapes permit nondestructive use of natural resources while allowing for tourism and recreation.  National Monuments are designated to protect unique sites of special natural or cultural interests.

Public Lands in the United States Federal lands in the United States. Approximately 42 percent of the land in the United States is publicly owned, with 25 percent of the nation’s land owned by the federal government.

Public Lands in the United States Resource conservation ethic The belief that people should maximize use of resources, based on the greatest good for everyone. Multiple-use lands A U.S. classification used to designate lands that may be used for recreation, grazing, timber harvesting, and mineral extraction.

Public Lands in the United States Land use in the United States. Public and private land in the United States is used for many purposes.

Public Lands in the United States More than 95 percent of all federal lands are managed by four federal agencies. Bureau of Land Management (BLM): grazing, mining, timber harvesting and recreation U.S. Forest Service (USFS): timber harvesting, grazing, and recreation National Park Service (NPS): recreation and conservation. Fish and Wildlife Service (FWS): conservation, hunting, and recreation