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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 earth’s 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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