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Sec 2 NA Gobal Warming
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Sec 2 NA Gobal Warming

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Transcript

  • 1. Global Warming
  • 2. Changes in the Earth’s Climate
  • 3. What is Global Warming?
    • The increase in air temperature throughout the world.
  • 4.  
  • 5.
    • What can you infer from both pictures?
  • 6.  
  • 7. What causes the temperature to increase?
    • Greenhouse effect
      • The gases in the atmosphere trap some of the heat from the Sun thus keeping the Earth warm.
      • Without these gases, the heat would be lost and living things might not survive because it gets too cold.
  • 8. Enhanced greenhouse effect
      • An accelerated greenhouse effect is caused by a rapid increase in the amount of greenhouse gases in the atmosphere, trapping more heat from the Sun.
  • 9. Types of greenhouse gases
    • Carbon dioxide
  • 10. Types of greenhouse gases
    • Nitrous oxide
  • 11. Types of greenhouse gases
    • CFCs
      • Chlorofluorocarbons
  • 12. Types of greenhouse gases
    • Methane
  • 13. Consequences of global warming
  • 14. Consequences
    • Changes in weather condition
    • Impact on plants
    • Impact on animals
    • Impact on people
    • Rising sea level
  • 15. Changes in weather condition
    • Drought
      • Too dry
      • Water evaporate faster
  • 16. Changes in weather condition
    • Floods
      • Too much water vapour in the atmosphere
      • Too much rainfall
  • 17. Impact on plants
    • Changes in rainfall and temperature could affect the growth of important crops.
      • Rice
      • Wheat
      • Corn
    • Leading to food shortage & famine
  • 18.  
  • 19. Impact on animals
    • Migration of animals due to temperature changes
      • Yaks and llamas have to move to mountainous or cooler area or else face extinction.
  • 20.  
  • 21. Impact on people
    • Increase in temperature leading to spread of diseases such as
      • Dengue fever
      • Malaria
      • Yellow fever
    • Increasing temperatures may lead to dehydration and heat stroke
  • 22. Rising sea level
    • Melting of the ice cap
    • Decrease in land area
    • Arable farmland may be destroyed
    • People have to move from coastal area to higher ground.
  • 23.  
  • 24.
    • Can you see the ice cap melting
    • Where does the water goes?
  • 25.  
  • 26. Any solutions?
  • 27.  
  • 28.