Sec 2 NA Gobal Warming

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Sec 2 NA Gobal Warming

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

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