What Is Global Warming Jl


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What Is Global Warming Jl

  1. 1. Global Warming <ul><li>What are the causes ? </li></ul><ul><li>What are the effects ? </li></ul><ul><li>How can we reduce it ? </li></ul>
  2. 2. What is Global Warming ? <ul><li>Global Warming is the heating up of our planet. </li></ul><ul><li>‘ The increase in the world’s average temperature, believed to result from the release of carbon dioxide and other gases into the atmosphere by the burning of fossil fuels.’ </li></ul>
  3. 4. What causes Global Warming ? <ul><li>Global warming is though to be due to the enhanced greenhouse effect . </li></ul><ul><li>The Earth is surrounded by a layer of gases, including carbon dioxide. </li></ul><ul><li>This keeps the Earth warm by preventing the escape of heat that would normally be lost from the atmosphere. </li></ul><ul><li>The gases act rather like the glass in a greenhouse. </li></ul><ul><li>They let in heat but prevent most of it from getting out. </li></ul>
  4. 5. It works just like a greenhouse …… letting more heat in than out.
  5. 6. The Greenhouse Effect
  6. 7. What causes Global Warming ? <ul><li>The burning of fossil fuels such as oil, coal and natural gas produces large amounts of carbon dioxide. </li></ul><ul><li>As the amount of this gas increases, the Earth becomes warmer. </li></ul>
  7. 8. Diagram of the Greenhouse Effect. <ul><li>Label your diagram of the green house effect </li></ul>
  8. 9. What are the greenhouse gases ?
  9. 10. CARBON DIOXIDE <ul><li>Carbon dioxide is produced by power stations, factories and road vehicles that burn fossil fuels. </li></ul><ul><li>Deforestation and the burning of rainforests also produces carbon dioxide . </li></ul>
  10. 11. METHANE <ul><li>Methane is released from waste dumps, farms and rice fields. </li></ul>
  11. 12. NITROUS OXIDES <ul><li>Nitrous oxides are emitted from car exhausts, power stations and fertilisers. </li></ul>
  12. 13. CFC’s (chloroflurocarbons) <ul><li>These are released from aerosols, plastic, foam packaging and fridges. </li></ul><ul><li>They are the most dangerous of greenhouse gases as they absorb more heat than carbon dioxide. </li></ul>
  13. 14. What greenhouse gas is produced from each photo ?
  14. 15. What are the effects of Global Warming ? <ul><li>The world is now warmer than it has been for thousands of years. </li></ul><ul><li>In the 20 th century, average temperatures rose by 0.6’C, with most of this increase in the last 40 years. </li></ul><ul><li>The warmest years ever recorded were in 1990 and in 1995. </li></ul><ul><li>By 2100, it is predicted that the average global temperature could be between 1.6 and 4.2’C higher than it is today. </li></ul>
  15. 16. What are the effects of Global warming ? <ul><li>NOBODY KNOWS EXACTLY WHAT THE EFFECTS WILL BE !!! </li></ul><ul><li>? </li></ul><ul><li>However, scientists are in agreement that changes in world climates and sea-levels are almost inevitable. </li></ul>
  16. 17. Below are some of the predicted effects of global warming. Tropical diseases eg malaria may spread to temperate regions such as UK. Climatic and vegetation belts would move. Low-lying areas would be flooded eg fens There could be an increase in insect pests like aphids and fleas. Hot regions would become hotter and deserts would spread. Ice caps and glaciers will start to melt causing sea levels to rise further Some plants and animals would become extinct. There may be more violent storms and weather extremes Sea temperatures will rise. Water will expand and sea levels could rise by 0.25-1.5m
  17. 18. What could the UK be like in 50-100 years time ? <ul><li>Write a list of ideas to describe what the UK could be like if global warming continues at this pace. ( p105KG and DME may help). </li></ul><ul><ul><ul><li>Eg no skiing in Scotland (as no snow). </li></ul></ul></ul>
  18. 19. What could the UK be like in 50-100 years time ?
  19. 20. What can we do ? <ul><li>Gaining international agreement to reduce the releases of greenhouse gases is difficult. </li></ul><ul><li>MEDC’s eg USA are reluctant as it would be expensive and there may be job losses as well as lowering of their standard of living. </li></ul><ul><li>LEDC’s are also reluctant as they need energy to create new jobs and raise their living standards. </li></ul><ul><li>Many countries also fail to see why its their problem – they didn’t create it!! </li></ul>
  21. 22. What is the Kyoto Protocol ? <ul><li>In 1997, the Kyoto Protocol brought agreement between countries that greenhouse gases should be reduced. </li></ul><ul><li>So far, many European countries eg Britain, have admitted difficulty in achieving the target. </li></ul><ul><li>In 2001, despite producing 25% of the world’s greenhouse gases already, president Bush stated that the USA would not be reducing emissions to the agreed levels. </li></ul>
  22. 23. What can WE do in our everyday lives to reduce greenhouse gas emissions ?
  23. 24. What are the effects of Global Warming? <ul><li>Using the information from today’s lesson, describe the effects that the increase in global temperature is causing in: </li></ul><ul><li>The UK </li></ul><ul><li>Europe </li></ul><ul><li>The rest of the world </li></ul><ul><li>HINT! Make sure that you include facts, sketch graphs etc in your description. I have maps if you want them! </li></ul>
  24. 25. QUESTIONS <ul><li>Why is INTERNATIONAL agreement necessary for the reduction of greenhouse gases ? </li></ul><ul><li>Why is it difficult to get this ? </li></ul><ul><li>What can we do to reduce the Enhanced Greenhouse Effect? </li></ul><ul><li>Why is ‘think global, act local’ a good idea? </li></ul>