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Types of resources
Perpetual, non-renewable, and renewable resources
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Perpetual resources:are
a resource that is inexhaustible on a human scale
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Types of Perpetual resources are... why are these resources not more popular?
- Wind power - a rapidly growing industry, a very clean technology, someproblem with wildlife (birds), could add lights and sound to correct this problem.
- Geothermal – technology is expensive, steam produced from pumping waterinto contact with the heat in the earth’s crust.
- Solar – technology is rapidly improving, is the best perpetual energy source.
- Tidal – tides in Massachusetts average 12 ft, in some areas of Canadaaverage 30 ft, these generate power we can use, non-polluting
- Discussion: All we lack is technology for perpetual resources. Developingtechnology is the basis for better use of these energy sources.
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Non-renewable resources:
- Oil, Coal, Minerals
- Discussion: It takes millions of years to make and hundreds of years to use it.These resources must be used with efficiency and recycling efforts. Ninety to 95% of energy used to drive a car is lost as heat- very inefficient.
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discuss the Renewable resources
- Soil hundreds of years to form 1” of top soil and hours to lose it toerosion.
- Forests.
- Rangeland important in developing countries, grassland grazing ecosystem.
- Wetlands provide many ecological services, often lost due to filling in foragricultural use 89% of wetland have been lost in Iowa, 91% in California.
- Wildlife Human impact due to expansion of urban areas leaves wildlifeless and less habitat We must decide what level of biodiversity we want to sustain.
- Fisheries Stocks are being used at a rapid rate.
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The health and productivity of resources depends on: _____ :“a philosophy of managing the environment in a way that does notdespoil, exhaust, or extinguish”
Conservation
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Conservation: Key concepts-
Land-use planning
Stewardship
Sustainability
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Explain Land use planning
- Which land areas should be developed, which ones to leave alone?
- a. Housing in forested area - these are areas of frequent natural burning
- b. Barrier beach development – loss of habitats to hotels and condos
- These are not sustainable practices; it appears little land use planning is done in today’smarket economy.
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Discuss Stewardship
- taking care of the planet
- Stop erosion
- Stop draining of wetlands
- Stop degrading ecosystems
- The big question:Responsibilities of private landowners regarding public resources?
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Discuss Sustainability
Harvest the interest and keep the principle. Sustainability isthe “bottom line” of resource use.
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-____ coined the term “conservation”
Aldo Leopold
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Gifford Pinchot...
1st Chief of the US Forest Service 1905-1910known for using resources - pragmatism
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John Muir
founder Sierra Club 1892, a naturalist, idea of protectingresources
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David Brower
founder Sierra Club Foundation, too radical asked towithdrawfounder Friends of the Earth, again too radicalwrote about human relationship with nature
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Theodore Roosevelt...
first political figure involved in conservation, brought230 acres into the federal system
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Aldo Leopold...
our most famous conservationist, beginning of a formalconservation movementDeveloped the idea of “land ethic”: as a respect for nature,while seeing nature as complex and fragile, a way to look at nature.
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Things we need to develop:
- Environmental Viewpoint - integrity versus supply
- Environmental ethics - concern for the heritage we are leaving behind
- Ecological economics - sustainability should drive economic development
- Conservation of biodiversity and biodiversity hotspots
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Environmental viewpoint
- concerns over ecological integrity have replaced concerns over supply
- Example: World water shortage At one time we just piped water wherever we need it.Now we try to understand the hydrologic cycle.-Aquifershave been lowered due to taking more than is replaced-Disconnection rivers are disconnected from their flood plains by levees, when flooding is stopped, aquifers are unable to fill-Salinization mineral build up on land due to irrigation water-Waterlogging land that is not able to drain-Aquatic pollution
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Environmental Ethicsa
- healthy environmental heritage is a primary responsibility
- Ethics: what is right and what is wrong
- Environmental ethics is a relatively new idea, it involves the question, What are weleaving for the future? Problems or resourcesHeritage is a primary responsibility.
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Ecological Economics
- frontier ethics not viable,
- sustainability should be the focus At one time in the United States there was always a new frontier to move to onceresources were used up; there are no new frontiers today. Once humans occupy an area sources are depleted
- Sustainability should be the focus of how we use our resources.
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Conservation of Biodiversity
which habitats do we protect?“Biodiversity hotspots” – an idea of protecting habitats with a largenumber of species per unit area
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Conservation principles are
No waste in nature
Recycling and reuse
Recycling limitation
Ecosystem relationships - Mesocarnivore release in altered North American ecosystems
The commons
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Principle of no waste in nature
Discussion: man-made waste products do not breakdown easily, we needto mimic the natural process of breakdown and reuse found in nature
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-Principle of recycling and reuse
Discussion: Glass, paper, and plastic are the big 3 for recycling.Tires:
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Principle of recycling limitation
We need to recycle, but when we do we are using energy and creating pollution,so reducing consumption is also needed.
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Principle of Ecosystem Relationships
- “Everyone is downstream of everyone else”Discussion: During the population of the United States all large carnivore (top carnivore– bears, mountain lions, wolves, etc.) populations were reduced. And, combined withfragmentation – the break up of forested lands by roads and housing, these factors led to:
- 1. “Mesocarnivore release” or an increase in middle carnivores (raccoons, opossum, skunk, fox
- 2. An increase in white-tail deer populations
- 3. Increasing mesocarnivores lead to reduced populations of songbirds, black foot ferret, ducks (eat duck eggs and
- ducklings).
Remember the concept – one change can change an entire ecosystem
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