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Global warming and its impacts

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    Global warming and its impacts Global warming and its impacts Presentation Transcript

    • Global warming and it's impact
    • Created by,
      M.Kohila,M.Phil.(Tam),B.A(Eng),
      Secondary grade teacher,
      S.M.R.V.H.S.S.,
      Vadasery,
      Nagercoil,
      Kanyakumary district,
      TAMILNADU-629001
    • 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.
    • Green house
      • Greenhouses are used to grow plants, especially in the winter.
      • Greenhouses work by trapping heat from the sun
      • The glass panels of the greenhouse let in light but keep heat from escaping.
      • This causes the greenhouse to heat up.
    • Green house gases
      Any gas that absorbs infra-red radiation in the atmosphere.
      water vapour
      Nitrous oxide (N2O)
      C
      O
      O
      C
      O
      O
      Halogenated Chlorofluoro carbons (HCFCs)
      Carbon dioxide (CO2)
      methane (CH4)
      Ozone (O3)
      Hydrofluorocarbons (HFCs).
    • 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.
    • Sources of green house gases
    • Smoke comes out from the factories
    • Greenhouse gases in the atmosphere behave much like the glass panes in a greenhouse.
    • Importance of the greenhouse effect
      Without the greenhouse effect, the Earth would not be warm enough for humans to live.
      But if the greenhouse effect becomes stronger, it could make the Earth warmer than usual.
    • Global warming
      Because of Green house effect the average temperature of the earth increases and this is known as Global warming
    • Sunlight enters the Earth's atmosphere, passing through the blanket of greenhouse gases.
    • Sunlight’s energy emains trapped in the atmosphere
    • Impacts of global warming
    • Impacts of global warming
      • Droughts
      • Floods
      • Level Rising temperatures of oceans and the sea
      • Tornadoes
      • Hurricanes
      • The melting of mountain glaciers
      • The reduction of snow cover
      • Dying coral reefs
      • Coastal erosion
      • Loss of coastal ecosystems
      • Extra warming may cause problems for humans, plants, and animals.
    • Flood
    • Drought
    • Level Rising of oceans and the sea
      Hurricanes
    • Coastal erosion
      In 1999
      Dying coral reefs
      In 2004
    • Tornado
      Melting of mountain Glaciers
    • Arctic continent ice melts
    • Antartica ice continent melts
    • The melting of mountain glaciers
      Arctic ice belts are melting
      To view the video of Glacier melting click here
    • The melting of mountain glaciers
      In 1859
      In 2001
    • The reduction of snow cover
      In 1928
      In 2004
    • Extra warming may cause problems for plants
      In 2002
      In 1985
    • 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
    • Poster on Global warming is issued to school students
    • The End Thank you