Presentation on theme: "Human Impact Land Resources Forest Resources Ocean Resources"— Presentation transcript:
1Human Impact Land Resources Forest Resources Ocean Resources Air ResourcesWater ResourcesOzone DepletionGlobal Warming
2Land Resources What is happening? Plowing removes the roots that hold the soil in place, increasing the rate of Soil erosionSOIL EROSION – is the wearing away of surface soil by water and wind.Desertification- the process of turning once productive areas into deserts from a combination of farming, overgrazing, and drought.
3Land Resources Why is it a problem? What is being done? Soil is a renewable resource, however it can be permanently damaged if mismanagedWhat is being done?Contour plowing- fields are plowed across the slope of the land to reduce erosionLeaving stems and roots of the previous year’s crops in place to hold soil
4Forest Resources What is Happening? Why is this a problem? Deforestation- loss of forest which leads to severe erosionWhy is this a problem?Old growth forest can be considered a nonrenewable resource because it would take centuries to reproduceForests provide O2 and remove CO2 from the atmosphereThey also store nutrients and provide food and habitat to organisms
5Forest Resources What is being Done? Tree farms can be planted and harvested efficiently making them fully renewable resourcesTree geneticists are also breeding new, faster-growing tree varieties that produce high- quality wood.
6Ocean Resources What is happening? Why is this a problem? Overfishing- fish stocks in many fisheries are being harvested faster than they reproduce.Why is this a problem?People depend on the ocean as a major source of protein, both from finfish and from shellfishWith the amount of fish caught each year increasing the fish cannot reproduce fast enough to keep up
7Ocean Resources What is being done? Limiting the catch of fish Certain fishing grounds have been temporarily closedAquaculture- farming of aquatic organisms
8Air Resources What is happening? Smog- a mixture of chemicals that occurs as a gray-brown haze in the atmosphere.This is due primarily to automobile exhausts and industrial emissionsPollutant- a harmful material that can enter the biosphere through air, land or waterThe burning of fossil fuels can release pollutants that cause smog and other problems in the atmosphere.
9Air Resources Why is it a problem? What is being done? This leads to toxins that enter the mouth, nose and lungs causing health problems over the long term.Gases released from the burning of fossil fuels combine with water vapor to form ACID RAINAcid rain kills plants, and changes the chemistry of soilsWhat is being done?Technology to control emissions from factory smokestacksStrict automobile emission standards and clean air regulations
10Water Resources What is happening? Pollution such as OIL SPILLS threatens our water supplyImproperly discarded chemicals can enter streams and riversDomestic sewage entering or water ways causing increase in bacteria growth
12Water Resources Why is this a problem? What is being done? Fresh water is used daily for everything from drinking and washing to watering crops and making steel.Although water is a renewable resource, the total supply of fresh water is limitedWhat is being done?Conservation by: drip irrigation, and consumer awareness of conservation
13Ozone Depletion What is happening? Chemicals called CFC’s which were once widely used in aerosol cans, the production of plastics and as coolants in freezers, refrigerators and air conditioners have caused a hole in our ozone layer and this hole is continuing to grow
14Ozone Depletion Why is this a problem? What is being done? The ozone layer absorbs a great deal of harmful UV rays before it reaches the earth’s surface .As the ozone layer is depleted UV exposure can cause sunburns, cancer, eye damage and decrease an organism’s resistance to diseaseWhat is being done?The US has joined many other nations to phase out the use of CFCs
15Global Warming What is happening? An increase in the average temperature of the biosphere.Over the past 120 years global temperatures have risen .5 degrees CelsiusCO2 and other gases are being released into the atmosphere and being retained causing more heat.
16Global Warming What is being Done? Why is this a problem? Alternate energy sources are being researched to reduce or stop the burning of fossil fuels that release gases into the atmosphere that retain heat.Why is this a problem?Polar ice caps will continue to melt and could rise enough to flood some low lying coastal areasStorms and other weather disturbances could become more frequent and severeHeat favors rodents weeds and insect that reproduce and spread quickly