Sec2 Ozone Depletion

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Sec2 Ozone Depletion

  1. 1. Ozone Depletion
  2. 2. What is ozone depletion? • The gradual destruction of the ozone layer caused mainly by the release of chlorofluorocarbons (CFCs) into the atmosphere. 07/08/09 2
  3. 3. Purpose of ozone layer • Act as a shield around the Earth • Protecting life on Earth from harmful ultraviolet (UV) rays of the Sun 07/08/09 3
  4. 4. 07/08/09 4
  5. 5. Cause of ozone depletion • CFCs have been identified as the main cause of damage to the ozone layer. • Chlorine contained in the CFCs are destroying the ozone molecules in the ozone layer. 07/08/09 5
  6. 6. Sources of CFCs • Aerosol spray 07/08/09 6
  7. 7. Sources of CFCs • Coolants in refrigerators / air cons 07/08/09 7
  8. 8. Sources of CFCs • Styrofoam 07/08/09 8
  9. 9. 07/08/09 9
  10. 10. 07/08/09 10
  11. 11. Consequences of ozone depletion • Impact on animals and plants – Damage plant tissues and destroy crops, resulting in decline in food supply. • Leading to famine – UV rays kill plankton which food for many marine animals • Destruction of food chain and web • Extinction of species 07/08/09 11
  12. 12. 07/08/09 12
  13. 13. Consequences of ozone depletion • Impact on people – Too much exposure to UV rays can cause disease like cataract and skin cancer – Weaken our immune system making us less resistant to diseases 07/08/09 13
  14. 14. Solution?
  15. 15. Measure to reduce ozone depletion (international level) • Sign international agreement to cut down usage of CFCs – Montreal protocol – Kyoto protocol (reduce greenhouse gases) • Reducing usage of CFCs products – Stop buying products containing CFCs – Disposal coolant in fridge & air con properly 07/08/09 15
  16. 16. Measure to reduce ozone depletion (national level) • Ban use of CFCs by signing Montreal Protocol – It is illegal to import products containing CFCs into Singapore. • New alternative to replace CFCs in – Refrigerators – Aerosol sprays – Air conditioners • All new cars in Singapore since 1995 are equiped with CFCs free air conditioning systems 07/08/09 16
  17. 17. Individual effort • Use / buy products without CFCs • When disposing products with CFCs in them should inform waste company. – These companies will take necessary actions to prevent CFCs from escaping into the atmosphere. 07/08/09 17

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