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Climate Change (Evidence (Tree Rings (A tree ring shows information about…

- - - - Newspapers
      - Diary Entries
      - Paintings
        
        E.g. London
    - - Tree RIngs
      - Ice Cores
- - - - Objects from outer space hit earth, ejecting dust into the atmosphere, blocking solar radiation and causing cooler temperatures
    - - The amount of radiation we receive from the sun varies over time
      - Periods of low solar activity are likely to produce cooler periods (glacial) where as periods of of high solar activity are likely to lead to warmer periods (interglacial)
    - - Some eruptions can produce so much material that it blocks radiation from the sun causing reduced temperatures and causing glacial periods
      - Large scale volcanic eruptions can eject huge amounts of ash and dust into the atmosphere
  - - - The earths orbit changes shape over approximately 100,000 years
      - This means that the earth's orbit around the sun is more circular making us slightly warmer (interglacial) and sometimes it can be more elliptical,making us slightly cooler (glacial)
    - - As the earth rotates on its axis, it does not do so perfectly
      - As the earth spins, it wobbles and as this happens, the direction of the axis changes
      - This impacts our seasons and creates either greater or smaller differences between summer and winter
      - This occurs over a period of approximately 24,000 years
    - - Over a period of over 40,000 years, the angle of tilt changes (further away) so summers are warmer and winters are cooler
      - The earth is tilted so that the poles are actually rotated from 23 degrees from vertical
      - If tilted closer, season difference is less
- - - - Population growth has led to a higher demand for food production
      - Mechanism on farms means more fuels used to produce this food
    - - Almost all types of transport rely on fossil fuels in some way
      - Transport has developed hugely with flights becoming more common and cars becoming more affordable - meaning more fossil fuels burned
    - - The demand for electricity is growing because of increasing population and new technologies
    - - This led to industrial growth and the need for more energy meaning more fossil fuels burnt
      - As levels of disposable income rise, increased demand for goods has arisen