Global warming - Science Vs Myth

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Global warming - Science Vs Myth

  1. 1. Science Vs Myth Shivantha Withanage ©
  2. 2. What is Global Warming? <ul><li>It is the natural way of keeping a planet warm. </li></ul><ul><li>But human activities have caused disastrous variations in this natural system. </li></ul><ul><li>So, global temperature is rising </li></ul><ul><li>beyond the critical point. </li></ul>
  3. 4. Chronicles of Global Warming. <ul><li>Charles David Keeling </li></ul><ul><li>Mauna Loa, Hawaii </li></ul><ul><li>1958 </li></ul>
  4. 5. Green House Gases. <ul><li>CO 2 </li></ul><ul><li>Methane </li></ul><ul><li>CFCs </li></ul><ul><li>Ozone </li></ul><ul><li>Nitrous Oxide </li></ul><ul><li>H 2 O (g) </li></ul>
  5. 6. How do GHGs warm the atmosphere? <ul><li>The warming effect of a molecule depends on its molecular vibrations.( Not on number of atoms) </li></ul><ul><li>If , Molecular vibration = Frequency of I.R </li></ul><ul><li>frequency waves </li></ul><ul><li>Then that molecule can act as a warming substance. </li></ul>
  6. 7. Effects of Global Warming.
  7. 8. Global Cooling Effect. <ul><li>Pinatubo stratvolcano- Philippines, 15 th of June 1991 </li></ul><ul><li>20 million tons of SO 2 and ash. </li></ul><ul><li>20 km up through the atmosphere. </li></ul><ul><li>Global temperature reduction- 0.4 ℃ - 0.5 ℃ </li></ul>
  8. 9. Your contribution to destroy the earth!! <ul><li>Your one day computer usage emits 1.1 kg of CO 2 </li></ul><ul><li>Turning on a light for six hours emits 680 g of CO 2 </li></ul><ul><li>Taking a bath uses up to 1.6 kg of CO 2 </li></ul><ul><li>Riding in a gasoline car for 4 km emits 2.3 kg of CO 2 </li></ul><ul><li>All humans the world over add </li></ul><ul><li>100 million tons of CO 2 </li></ul><ul><li>into the atmosphere each day. </li></ul>
  9. 10. How can we stop this?? <ul><li>Reduce the emission of GHGs. </li></ul><ul><li>Use carbon filters. </li></ul><ul><li>Use electricity and petroleum properly. </li></ul><ul><li>Use public transportation services. </li></ul><ul><li>Say “No” to coal and petroleum power & promote alternative energy sources. </li></ul><ul><li>Avoid using polythene. </li></ul><ul><li>Protect forests and plant trees. </li></ul>
  10. 11. <ul><li>If we fail in this task, the only solution is </li></ul><ul><li>Adaptation </li></ul>
  11. 12. It’s your choice.
  12. 13. <ul><li>Thank You! </li></ul>live for today & save the future.

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