Global warming and its impacts

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Kohila

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Global warming and its impacts

  1. 1. Createdby, M.Kohila,M.Phil.(Tam),B.A(Eng), Secondarygrade teacher, S.M.R.V.H.S.S., Vadasery, Nagercoil, Kanyakumary district, TAMILNADU-629001
  2. 2. Teaching objectives •To understand about the green house gases. •To undertstand about the infrared radiations. •To understand about the air pollution. •To understand about the green house effect. •To understand about the global warming. •To understand about the effects of global warming.
  3. 3. •The glass panels of the greenhouse let in light but keep heat from escaping. •This causes the greenhouse to heat up. Green house •Greenhouses are used to grow plants, especially in the winter. •Greenhouses work by trapping heat from the sun
  4. 4. water vapour C OO Carbon dioxide (CO2) Green house gases methane (CH4) Nitrous oxide (N2O) Ozone (O3) Hydrofluorocarbons (HFCs). Any gas that absorbs infra-red radiation in the atmosphere. C OO Halogenated Chloro fluoro carbons (HCFCs)
  5. 5. Green house effect Carbondioxide present in the atmosphere absorbs infrared radiations reflected from the surface of the earth and heats up the atmosphere. This heating up of atmosphere by carbondioxide in the air is called green house effect.
  6. 6. Sources of green house gases
  7. 7. Smoke comes out from the factories
  8. 8. Greenhouse gases in the atmosphere behave much like the glass panes in a greenhouse.
  9. 9. But if the greenhouse effect becomes stronger, it could make the Earth warmer than usual. Importance of the greenhouse effect Without the greenhouse effect, the Earth would not be warm enough for humans to live.
  10. 10. Global warming Because of Green house effect the average temperature of the earth increases and this is known as Global warming
  11. 11. Sunlight enters the Earth's atmosphere, passing through the blanket of greenhouse gases.
  12. 12. Sunlight’s energy emains trapped in the atmosphere
  13. 13. Flood
  14. 14. Drought
  15. 15. In 1999 In 2004 Coastal erosion Dying coral reefs
  16. 16. Tornado Melting of mountain Glaciers
  17. 17. Arctic continent ice melts
  18. 18. Antartica ice continent melts
  19. 19. Arctic ice belts are melting To view the video of Glacier melting click here
  20. 20. In 1859 In 2001
  21. 21. In 1928 In 2004
  22. 22. In 1985 In 2002
  23. 23. Speech on Global warming and its impacts (24-06-2008) Dr.Santhanakumar,District co-ordinater,National Green corps,Kanyakumary district To view this video Click here
  24. 24. Poster on Global warming is issued to school students

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