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Energy resources

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Energy resources

  1. 1. 3.3 Energy resourcesTopic 3: Human population, carrying capacity and resource use
  2. 2. Topic 3: Human population, carryingcapacity and resource use3.3: Energy resources3.3.1: Available Energy ResourcesAll energy on the planetcomes either directly or Simplified view of Energy Pathways Solar Radiation Light reflectedindirectly from the sun from atmosphere Green House Effect Atmosphere Energy released as "IR" (HEAT) Light absorbed Light absorbed by plants by surfaces Particles gain energy and move Photosynthesis more rapidly "DRIVES" "DRIVES" Biological Physical Processes Processes Life Processes Food chains Atmospheric circulation Eventual dissipation Oceanic currents as heat Water cycle Fossilisation "energy sink"
  3. 3. Topic 3: Human population, carryingcapacity and resource use3.3: Energy resources3.3.1: Available Energy Resources Energy resources can be classified as either: Renewable or Non renewable
  4. 4. Topic 3: Human population, carryingcapacity and resource use3.3: Energy resources3.3.1: Available Energy ResourcesNon renewable energy resources:Fossil fuels - oil, natural gas and coalNuclear energy
  5. 5. Topic 3: Human population, carryingcapacity and resource use3.3: Energy resources3.3.1: Available Energy ResourcesRenewable energyresources:Wind. Biomass.Wave. Hydroelectric.Solar. Geothermal.
  6. 6. Topic 3: Human population, carryingcapacity and resource use3.3: Energy resources3.3.1: Available Energy ResourcesGlobal energy use Energy source Approximate global usage (%) Non- renewable Oil 38 Coal 25 Natural Gas 22 Uranium 5 Renewable Biomass (wood) 3 Hydroelectric 3 Wind 2 Solar 2 Wave 2
  7. 7. Topic 3: Human population, carryingcapacity and resource use3.3: Energy resources3.3.2: Evaluating Energy ResourcesAdvantages and disadvantages of a particular energyresource can be group into three broad areas:EconomicEnvironmentalSocial
  8. 8. Topic 3: Human population, carryingcapacity and resource use3.3: Energy resources3.3.2: Evaluating Energy Resources Pathways of Soil Erosion in the Sahel Increasing populationEconomic, Environmental and Social More food requiredfactors for any resources changes with the More More fuel Increasedcontext in which the resource is used. needed for livestock grazing cooking More fuel Increased Deforestation needed for grazingUsing wood as the main fuel source for for firewood cookingcooking may not have a major impact in a Removal of vegetationheavily forested scandinavian country but Soil exposed to wind andin saharan Africa it would water Top soil can blow away SOIL EROSION
  9. 9. Topic 3: Human population, carryingcapacity and resource use3.3: Energy resources3.3.2: Evaluating Energy ResourcesOil- AdvantagesExtraction technology is Large oil reserves stillwell developed existCan be Oil provides more ethantransported relatively ch just an energy source -eaply and in large e.g. Plasticsamounts Efficient energy source
  10. 10. Topic 3: Human population, carryingcapacity and resource use3.3: Energy resources3.3.2: Evaluating Energy ResourcesOil- DisadvantagesMost of the worlds oil reserves Accidents in extraction andtend to be where consumption is transport can lead to pollutionlow and not spread evenly around causing habitat destructionthe planet Expense of dealing with pollutionCombustion of oil leads toclimate change through the As supply is used up newer supplyrelease of carbon dioxide sources are more difficult to extract due to where they are (Arctic) or the form in which the oil exists (shale tar)
  11. 11. Topic 3: Human population, carryingcapacity and resource use3.3: Energy resources3.3.2: Evaluating Energy ResourcesSolar power - AdvantagesSunlight is free Can operate on small scale as well as largeDoes not produce greenhouse gasesWhen used for heating wellinsulated houses can becheaper than coal or oil
  12. 12. Topic 3: Human population, carryingcapacity and resource use3.3: Energy resources3.3.2: Evaluating Energy ResourcesSolar power - DisadvantagesOnly useful were sunlight is Aesthetically problematic inplentiful - not very effective rural areasduring NorthernHemisphere winter Technology still expensiveTakes up a lot of space forcommercial solar harvesting
  13. 13. Topic 3: Human population, carryingcapacity and resource use3.3: Energy resources3.3.3: Choice of Energy ResourcesThe choice of energy sources that a nation or societyuses is very much dependent upon several factors:Availability Historical useCost Industrial needTechnology National politics
  14. 14. Topic 3: Human population, carryingcapacity and resource use3.3: Energy resources3.3.3: Choice of Energy ResourcesFrance is a good example of a Nation whoseenergy policy has changed over time.Energy use in France is mainly for thecommercial production of electricity and fuelfor homes and transport
  15. 15. Topic 3: Human population, carryingcapacity and resource use3.3: Energy resources3.3.3: Choice of Energy ResourcesTraditionally Frances main energyrequirements were filled by coalMainly from the French Coal fields in Alsace,Lorraine and Nord Pas de Calais
  16. 16. Topic 3: Human population, carryingcapacity and resource use3.3: Energy resources3.3.3: Choice of Energy ResourcesIncreasing coast of production resulted inFrance looking for alternatives to coalUnlike the UK or Norway France has no oilreserves of its own, so if coal was replacedwith oil national energy security would bedependent upon an imported energy resource
  17. 17. Topic 3: Human population, carryingcapacity and resource use3.3: Energy resources3.3.3: Choice of Energy ResourcesThe answer for France was to invest heavily inNuclear power75% of all France’s energy needs are met by NuclearpowerFrance produces so much electricity from Nuclearpower that it exports 18% of its production
  18. 18. Topic 3: Human population, carryingcapacity and resource use3.3: Energy resources3.3.3: Choice of Energy Resources Nuclear Reactors in France
  19. 19. Topic 3: Human population, carryingcapacity and resource use3.3: Energy resources3.3.3: Choice of Energy Resources Golfech Nuclear Reactor http://www.flickr.com/photos/26106240@N06/2909771892/lightbox/
  20. 20. Topic 3: Human population, carryingcapacity and resource use3.3: Energy resources3.3.3: Choice of Energy ResourcesFollowing the Fukushima NuclearAccident in 2011, concerns have beenraised over the safety of Nuclearpower.Partly because of this France hasincreased its development of alternativeenergy sources.

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