Destruction Of The Ozone Layer

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Destruction Of The Ozone Layer

  1. 1. Destruction of the Ozone Layer The ozone layer is a layer in Earth’s atmosphere which contains relatively high concentrations of ozone (O3). This layer absorbs 93-99% of the sun's high frequency ultravioletlight, which is potentially damaging to life on earth.
  2. 2. Problem Description <ul><li>Despite Ozone Layer is vitally important to life because it absorbs biologically harmful ultraviolet (UV) radiation emitted from the Sun, but it is being destroyed, forming a big hole in it that is commonly referred to as the ozone hole . It is particularly created over Antarctica where exists a special condition that accelerates the depletion of the ozone layer. </li></ul>
  3. 3. Causes <ul><li>Chlorofluorocarbons (CFCs) contain fluorine, carbon and chlorine atoms. Besides this, they are considered to be the main cause of Ozone depletion. </li></ul><ul><li>CFCs are widely used as coolants in refrigeration and air conditioners, as solvents in cleaners, particularly for electronic circuit boards, as a blowing agents in the production of foam (for example fire extinguishers), and as propellants in aerosols. </li></ul><ul><li>A chlorine atom reacts with an ozone molecule, taking an oxygen atom with it (forming ClO) and leaving a normal oxygen molecule. The chlorine monoxide (i.e., the ClO) can react with a second molecule of ozone (i.e., O3) to yield another chlorine atom and two molecules of oxygen. </li></ul>
  4. 4. Effects <ul><li>An increase in the incidence of skin cancer . </li></ul><ul><li>A large increase in cataracts and Sun burning. </li></ul><ul><li>Suppression of immune systems in organisms. </li></ul><ul><li>Adverse impact on crops and animals. </li></ul><ul><li>Reduction in the growth of plankton found in the Earth's oceans. </li></ul><ul><li>Cooling of the Earth's stratosphere and </li></ul><ul><li>Global Warming. </li></ul>
  5. 5. Posible Solutions <ul><li>Reduce the use of large amounts of CFCs is helpful. Moreover, the only long term solution to solve the problem of depletion of the ozone layer is to phase out the use of CFCs. </li></ul>
  6. 6. Conclusions <ul><li>We must be aware of the effects that ozone depletion can cause. </li></ul><ul><li>Eventhough there are some protocols in order to reduce CFC use, we should use them conciously, so that we can have good healt for a long time and maybe let the ozone layer rebuild by itself. </li></ul><ul><li>We could use sunscreen to protect our skin from dangerous UV rays. </li></ul>
  7. 7. References <ul><li>http://www.epcc.pref.osaka.jp/apec/eng/earth/ozone_layer_depletion/susumu.html </li></ul><ul><li>http://en.wikipedia.org/wiki/Ozone_layer </li></ul><ul><li>http://www.epcc.pref.osaka.jp/apec/eng/earth/ozone_layer_depletion/susumu.html </li></ul><ul><li>http://www.ace.mmu.ac.uk/eae/ozone_depletion/older/CFCs.html </li></ul><ul><li>http://en.wikipedia.org/wiki/Ozone_depletion </li></ul><ul><li>http://en.wikipedia.org/wiki/Catalytic </li></ul><ul><li>http://www.umich.edu/~gs265/society/ozone.htm </li></ul><ul><li>http://www.ausetute.com.au/cfcozone.html </li></ul>

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