Climate and change

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  • Climate and change
    • Past climate change
      • How do we know climate has changed?
        • fossils animals found in regions where not found today
        • glaciation regions now free ice
        • evidence ice cores show Co2 and oxygen atmosphere when ice formed
      • what is climate?
        • Average weather conditions over a long period of time
    • The cause of change
      • Volcanoes!
        • Large eruptions spew poisonous    gasses
        • dust blocks out incoming solar radiation
        • Mt Pinataubo 1991, Laki eruption 1783 Mt Toba 70k yrs ago
      • Sunspots?
        • Sunspots darker areas sun mean greater solar activity
        • come cycle 11 yrs
        • periods few seen 1645-1715 'Little Ice Age'
      • change in earths orbit/rotation
        • shape of earths orbite change know ECCENTRICITY
        • Earth wobbles axis known PRECESSION
        • tilt on axis
    • Case study: The Little Ice Age
      • What is it?
        • periods of climate change in recent past between 1300-1870
      • What caused it?
        • Probably caused North Atlantic oscillation
      • Imapct
        • The Baltic Sea froze over
        • winters colder longer
        • cold conditions lead crop failure
        • Greenland abandoned survival impossible
        • price grain increase
        • commercial vineyards disappear in England
        • storminess flooding increase
    • Impact on megafauna
      • Extinction takes place species no time adapt
      • temperature increase 5 degrees in very short time (1000yrs)
        • During period 130 species disappear
          • could not cope climate change food disappearing so died out
          • humans hunt to extinction
    • Greenhouse effect
      • What is it?
        • Greenhouse gasses retain heat sun otherwise would be reflected
      • most sun energy absorbed group radiated back into atmosphere trapped by GG
      • Impact on global   temperature and sea level
        • GG directly linked global warming
        • Sea level change
          • ice caps glaciers melting
          • THERMAL EXPANSION water expands
    • What we do and why we do it
      • What we do
        • Industrial revolution
        • ppl produce 10-25 tonnes Co2 yr
        • Rapid  industrialisation
      • why we do it
        • energy supply
        • transoprt
        • industry
      • Other origins of GG
        • Nitrous Oxide produced jet engines, fertiliser, sewage
        • Methane - cows
        • Human activities cutting trees
    • Impact on global   temperature and sea level
      • GG directly linked global warming
      • Sea level change
        • ice caps glaciers melting
        • THERMAL EXPANSION water expands
    • Case study: What future
      • UK
        • Enviromental
          • Rising sea level
            • low lying ares cost too much protect risk flood London increase
          • Changing temperatures and rainfall
            • Temp rise change rainfall patterns cause drought
          • Wild weather
            • Increase storminess + erosion on coasts
          • Changing ecosystem
            • Species disappear  and return
        • Economic
          • Agriculture
            • farming patterns change more vines
          • Industry and services
            • rist London pose serious threat centre economic trade
          • Tourism
            • benefit less need travel overseas4 sun
  • periods of climate change in recent past between 1300-1870
  • Important!

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