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Unformatted text preview: RNR 20/10/2009 02:14:00 26 August 09, Wednesday RNR 1001 Natural Resource Conservation This course is about Natural Resources Types of resources: 1. Perpetual resources: a resource that is inexhaustible on a human scale (never will run out) Examples: a. Wind power- a rapidly growing industry, a very clean technology, some problem with wildlife (birds), could add lights and sound to correct this problem b. Geotherma l technology is expensive, steam produced from pumping water into contact with the heat in the earths crust c. S olar technology is rapidly improving, is the best perpetual energy source d. T idal tides in Massachusetts average 12 ft, in some areas of Canada average 30 ft, these generate power we can use, non-polluting Discussion: All we lack is technology for perpetual resources. Developing technology is the basis for better use of these energy sources. 2. 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. Recycling is important. 3. Renewable resources : a. Soil hundreds of years to form 1 of top soil and hours to lose it to erosion b. Forests trees reproduce, grow, can use them for crops and grow new trees. c. Rangeland important in developing countries, grassland grazing ecosystem d. Wetlands provide many ecological services, often lost due to filling in for agricultural use 89% of wetland have been lost in Iowa, 91% in California e. Wildlife Human impact due to expansion of urban areas leaves wildlife less and less habitat We must decide what level of biodiversity we want to sustain. f. Fisheries Stocks are being used at a rapid rate. The health and productivity of resources depends on: Conservation: a philosophy of managing the environment in a way that does not despoil, exhaust, or extinguish Example: Conserving the resource of sockeye salmon A complex set of variables: The salmon is harvested commercially and recreationally we also harvest items the salmon feed on the salmon must return upstream to spawn, spawns only once we build dams, how does a salmon get over a 230 ft dam we degrade the spawning habitat by cutting forest and allowing runoff into the stream monitor salmon predators,...
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This document was uploaded on 10/27/2011 for the course RNR 1001 at LSU.
- Fall '08
- The Land