climate change

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  • Climate Change
    • Little Ice Age
      • Effects On People
        • Food prices increased.
        • Ice lakes burst periodically,destroying buildings and killing people.
        • Population decreased - cold and no food. (great famine of 1317-1325).
      • Effects On Farming
        • Changing times of harvest.
        • New crops have to adapt to climate.
        • Crops didn't ripen and harvest failed
    • Evidence Of Climate Change
      • The Distant Past
        • Fossilised animals, plants and pollen that no longer live in the UK.
        • Landforms, like U-shaped valleys left by retreating glaciers.
        • Samples from  the ice sheets of Greenland and Antartica.
      • The Recent Past
        • Old photographs, drawings and paintings of the landscape.
        • Written records such as diaries, books and newspapers.
        • Recorded dates of regular events e.g harvests.
    • Changes In The UK Climate
      • Warm in roman times.
      • Cold from 1400-1800.
      • Warm and cold spells since 400 BC.
    • Causes Of Climate Change
      • Eruption Theory
        • Volcanic eruptions can alter the earths climate.
        • Has to be large to change anything.
        • Eruptions produce: ash and sulphur dioxide gas
          • Ash stops sunlight getting to earth.
          • If gas and ash rise high enough they spread round the earth.
      • Orbital Theory
        • Occurs because of the way the earth orbits the sun.
        • If earths axis tilts or wobbles, it affects the amount of sunlight the earth recieves.
      • Asteroid Colllisions
        • A huge asteroid would blast tones of ash into the atmosphere.
        • Climate would cool and dust and ash would block sunlight.
      • Sunspots and Solar Outputs
        • Sunspots are black areas on the surface of the sun.
        • Lots of spots mean more solar energy fired out to earth from the sun.
    • Major Climatic Events
      • Extinction Of Megafauna
        • Less prey for carnivores (humans hunted for them.
        • Climate earmed up.
        • Migrated to find a climate to suit them. It was hard to find the right plants to eat. Disrupted food chains.
    • Future Climate Change
      • Green House Gases
        • Human Activities That Increase It
          • Power Statons.
          • Travelling.
      • Ocean Influence.
        • warm ocean current impacts it.
      • Air Mass.
    • Greenhouse Effectt
      • The way that gases in the atmosphere trap heat from the sun.
      • Enhanced Greenhouse Effect
        • Enhanced means its working more strongly.
        • Evidence
          • CO2 levels have risen.
            • Developed places produce more CO".
          • Global temps have gone up.
          • Sea levels risen by 195mm in last 135 years.
    • Effects Of A Warmer UK
      • Costs
        • Drought and water shortage.
        • More illnesses such as skin cancer.
        • Certain animals may die out.
      • Benefits
        • Tourism will increase.
        • Heating costs reduced.
        • Less elderly deaths.
    • Effects Of Future Climate Change In LEDC (Egypt)
      • Flooding.
      • Water Shortages.
      • Loss of farmland and food.
      • Spread of Disease..
      • Rising temps.
      • Rising sea levels.
      • Water conflict in Egypt.
        • South Egypt take water from the Nile.

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