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Greenhouse gases and global warming by MUHAMMAD FAHAD ANSARI 12IEEM 14

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MUHAMMAD FAHAD ANSARI 12IEEM 14

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Greenhouse gases and global warming by MUHAMMAD FAHAD ANSARI 12IEEM 14

  1. 1. Ozone Depletion MUHAMMAD FAHAD ANSARI 12IEEM 14
  2. 2. Ozone DepletionWhat can be done to preventdepletion of the ozone?
  3. 3. Ozone Ozone is comprised of 3 oxygen molecules, known as O3. When we hear the term Oxygen, it is usually referring to the Oxygen that we breathe, known as O2. O2 is a necessary component for life (almost all life ) on Earths surface. It is the form of Oxygen that we breathe. It is used in respiration in animals and photosynthesis in plants.
  4. 4.  Ozone, or O3, is in fact toxic to living creatures, but without it we would be in a lot of danger. Ozone is naturally found in the upper level of our atmosphere. i.e. stratosphere It absorbs many of the harmful rays of the sun, known as Ultraviolet radiation (UV-A, UV-B and UV-C) which can cause cancer and cellular damage.
  5. 5. Causes Pollution is a major source of depletion of the Ozone layer. Many Man-made pollutants contain compounds called Chlorofluorocarbons (CFCs) and bromofluorocarbons. These compounds can rise to the upper level of our stratosphere Where UV light breaks them into free radicals of Chlorine (Cl) and Bromine (Br). Each of these radicals is then free to react with O3 and catalyze a chain reaction capable of breaking down over 100,000 ozone molecules.
  6. 6. Health Effects As the ozone layer diminishes, Australias natural sun block begins to fade. This is a problem because Ultraviolet radiation mainly affects our skin and eyes. Even though we cant feel it, the higher the dose, the greater likelihood of damage. The most serious effect of sunlight on the skin is the generation of cancer. Most skin cancers are found in people over 40 years old. Australia has the highest incidence of skin cancer in the world. With only 3% of the worlds population, they manage to report for 6 % of all dangerous forms of skin cancer diagnosed globally. About 1200 people die each year in Australia as a result of skin cancer.
  7. 7. Greenhouse gases Gases that are part of the greenhouse gas layer in the atmosphere. These gases form a practically invisible bubble around Earth that reflect some forms of waves. The more common gases include carbon dioxide, methane, and nitrogen oxides. These gases in the atmosphere create a greenhouse effect on Earth
  8. 8.  They allow the suns ray to go into Earth but upon escaping they are reflected back to Earth again. Its like sitting in a greenhouse without any windows or doors throughout summer, eventually you get hot.

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