climate change

Part 2... wishing you all the best of luck in your upcoming geography exams

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  • Created by: Ezgi_18
  • Created on: 04-05-14 21:25
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  • Climate Change - part 2
    • Greenhouse effect
      • Greenhouse gases retain heat from the sun. Solar energy passes through the atmosphere without having any real impact on it. Half of it is absorbed by the earth, the other half, which is absorbed by the ground, is radiated back into the atmosphere and some of this radiation is trapped by greenhouse gases.
      • Methane and Nitrous oxide are examples of greenhouse gases. The one associated most with human activity is Carbon Dioxide
        • Recent changing in Carbon Dioxide levels are a result of burning fossil fuels such as gas, oil and coal.
      • The largest contributing countries are China, USA, Russia, India and Japan.
      • Human activities have increased the amount of Carbon Dioxide produced and reduced the ability of the environment to absorb it.
      • Greenhouse gas origins: Nitrous oxide is produced by jet engines, fertilisers and sewage farms. Methane is most commonly associated with cows producing gas as they graze.
    • The impact of greenhouse gases on global temperatures and sea level
      • Global temperatures have risen quite sharply in the past 100 years. Vast majority of experts agree that greenhouse gases are directly linked to global temperatures
        • Although we cannot be certain about the future temperatures- it is predicted that temperature could rise between 1 degrees celcius if we take action now to 6.4 degrees celcius if we do not do anything
      • Sea level changes
        • As temperatures rise, water expands - thermal expansion takes place independently of melting ice.
        • Melting ice caps and glaciers.
        • There could be a rise in sea level of between 300mm and 1000mm depending on how we tackle global warming.
    • Impacts of global warming on developed and developing countries
      • The UK (DEVELOPED COUNTRY)
        • Environmental impacts
          • New bird and animal species migrate to the UK while others will disappear
          • Changes to fish species as temperature rises
          • Increaed storminess means more erosion on coasts.
        • Economic impacts
          • Cost of protecting low lying areas such as London and East Anglia from rising sea levels
          • Costs to the NHS of health problems caused by more frequent heatwaves
          • More frequent and costly flood events
          • Farmers will need to change crops
      • Bangladesh (DEVELOPING COUNTRY)
        • Environmental impacts
          • More frequent/stronger cyclones in the Bay of Bengal
          • Rising sea levels erode the country's vital coastal mangrove swamps
          • Northwest Bangladesh could become more prone to drought
        • Economic impacts
          • Flooding becomes more common with increased rainfall, destroying crops and homes
          • 10% of the land could be lost to rising sea levels, leaving people landless and short of food
          • Severe water shortages, if monsoon rains fall, could lead to widespread famine
  • Environmental impacts
    • More frequent/stronger cyclones in the Bay of Bengal
    • Rising sea levels erode the country's vital coastal mangrove swamps
    • Northwest Bangladesh could become more prone to drought

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