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Ozone Depletion


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Ozone Depletion

  1. 1. Ozone Depletion By Clarisse, Suleyman and Suzy
  2. 2. Table of Content <ul><li>Defining Ozone Depletion </li></ul><ul><li>The Worst Effected Region </li></ul><ul><li>Main Causes </li></ul><ul><li>Why and How Ozone Depletion Happens </li></ul><ul><li>Consequences </li></ul><ul><li>Few Diagrams Explaining the Consequences </li></ul><ul><li>Suggested Solutions </li></ul>
  3. 3. Defining Ozone Depletion <ul><li>Ozone Layer: </li></ul><ul><li>- protects the earth from ultraviolet rays </li></ul><ul><li>part of the earth’s atmosphere </li></ul><ul><li>contains high concentration of Ozone (O3) </li></ul><ul><li>concentration of O3 is small </li></ul><ul><li>important to life </li></ul>Ozone Depletion: - large hole in the protection of the earth (ozone) - observed loss of ozone (over 50 years) - mainly above the northern and southern poles - more ultraviolet rays hitting/affecting earth - Man made substances
  4. 4. The Worst Hit Due to Ozone Depletion <ul><li>Where? </li></ul><ul><li>Antarctica (worst hit). </li></ul><ul><li>What? </li></ul><ul><li>Ozone layers have dropped to 33% since 1975 </li></ul><ul><li>Over 50% is destroyed </li></ul><ul><li>Great shock </li></ul><ul><li>Why/How? </li></ul><ul><li>Polar regions have larger variation in sunlight </li></ul><ul><li>Extremely low temperatures and Antarctic conditions </li></ul><ul><li>Cloud formation cause crystals </li></ul><ul><li>Crystals cause many reactions to occur </li></ul>
  5. 5. Main Causes <ul><li>What? </li></ul><ul><li>Cosmic Rays </li></ul><ul><li>Sulphur put into the atmosphere </li></ul><ul><li>Stratospheric clouds together with Chlorine, Bromine and nitrogen oxides </li></ul><ul><li>Chlorofluorocarbons (CFC’s) </li></ul>Stratospheric clouds
  6. 6. Why?How? <ul><li>Cosmic Rays: </li></ul><ul><li>Different types of rays </li></ul><ul><li>Rays react differently towards ozone </li></ul><ul><li>Not guaranteed as the cause </li></ul><ul><li>Sulphur: </li></ul><ul><li>Scientist still testing </li></ul><ul><li>Might not be the cause </li></ul><ul><li>Stratospheric Clouds: </li></ul><ul><li>Part of ozone layer </li></ul><ul><li>Support chemical reactions such as chlorine </li></ul><ul><li>Chlorine is a catalyst for ozone depletion </li></ul><ul><li>Stops the nitric acid from forming the cloud </li></ul><ul><li>Chlorofluorocarbons: </li></ul><ul><li>Compounds of chlorine, carbon and fluorine </li></ul><ul><li>Used as propellants </li></ul><ul><li>Unreactive </li></ul><ul><li>Remain in atmosphere for long time </li></ul>
  7. 7. Consequences Leading to Health Concerns <ul><li>10% loss in ozone, becomes 26% increase in skin cancer e.g. malignant melanoma- (skin cancer) e.g.2 Basal and Squamous Cell Carcinomas (skin cancer) </li></ul><ul><li>Reduces resistance to disease </li></ul><ul><li>Reduction in food products- damage plant tissues + destroys crops </li></ul><ul><li>Increase in eye disorders + cataracts </li></ul><ul><li>Decrease in plankton </li></ul>
  8. 8. A diagram of how ozone depletion affects the rest of our world.
  9. 9. Important Solutions to Minimize Ozone Depletion <ul><li>Suggestions: </li></ul><ul><li>Use less chemicals, phase out pollution </li></ul><ul><li>Work together to reduce rate of depletion </li></ul><ul><li>Add ozone to stratosphere </li></ul><ul><li>Destroy CFC’s </li></ul>