Global Warming Presentation(


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Global Warming Presentation(

  1. 1. GLOBAL WARMING AND CLIMATE CHANGE Susheel Dwivedi School of Biotechnology B H U Varanasi                                      
  2. 2. What is Global Warming? <ul><li>Global warming results from an increased greenhouse effect i n the atmosphere. You can picture it as a blanket of gases that wraps around the Earth and holds the heat in. </li></ul><ul><li>Carbon dioxide is the most common gas that causes global warming. </li></ul><ul><li>As global temperatures increase, the climate changes . </li></ul>
  3. 5. What is the Greenhouse Effect? <ul><li>Certain gasses in the atmosphere absorb heat energy and reduce the amount that escapes into space </li></ul><ul><li>This ‘trapping’ of heat from our only source of warmth – the Sun – by the atmosphere is known as the ‘Greenhouse Effect’ </li></ul><ul><li>This gives us a global average temperature of +15 °C rather than -18°C if we had no Greenhouse Effect </li></ul>
  4. 6. Important Facts <ul><li>Water vapour is the most important greenhouse gas - ~ 60 - 98% of the greenhouse effect is due to water vapour in the atmosphere (jury still out) </li></ul><ul><li>CO 2 and other minor gasses account for the remainder </li></ul><ul><li></li></ul>
  5. 8. “… There is new and stronger evidence that most of the warming observed over the last 50 years is attributable to human activities.” --Intergovernmental Panel on Climate Change, 2001
  6. 9. Painting by Charles Shaw
  7. 12. Watt’s Steam Engine
  8. 13. Internal Combustion Engine
  9. 16. What Causes Global Warming?
  10. 17. Myths about global warming <ul><li>It is not caused by a hole in the ozone layer. </li></ul><ul><li>It is not caused by poisonous gases. </li></ul><ul><li>It does not mean that we are running out of oxygen. </li></ul><ul><li>It is not too late to do something about it. </li></ul>
  11. 18. <ul><li>If The atmosphere did not absorb incoming heat, we would roast all day and freeze-dry at night and end up like a sun-dried tomato </li></ul><ul><ul><li>Mercury - + 427 to – 172 ºC </li></ul></ul><ul><ul><li>Mars - temperate zone soil </li></ul></ul><ul><ul><li>+ 27 to – 80 ºC </li></ul></ul><ul><ul><li>Moon - + 107 to 153 ºC </li></ul></ul>What If?
  12. 19. 1938 1991
  13. 20. Wild Fires
  14. 21. Drought and water shortages
  15. 22. Effects on wildlife
  16. 23. Solutions <ul><li>Use less energy </li></ul><ul><li>Use different sources of energy </li></ul>
  17. 24. Energy efficiency and conservation
  18. 26. Hydroelectric dams generate about 10% of our nation’s energy
  19. 29. CSP <ul><li>Concentrating </li></ul><ul><li>Solar </li></ul><ul><li>Power </li></ul>
  20. 31. <ul><li>Albert Einstein said: &quot; If you succeed in using the nuclear-physical findings for peaceful purposes, it will open the way to a new paradise&quot;. </li></ul>
  21. 32. ! ! Thank you