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  • 1.2 Climate Change causes
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Climate Change factors
1.Natural Factors
    a)external changes(from extraterrestrial systems):
      1)Changes in Solar Output
      2)Changes in the Earth's Orbit
      3)Interstellar Dust
    b)internal changes(from ocean, atmosphere and land systems)
      1)changes in the concentrations of atmospheric gases
        -greenhouse effect
      2)natural activities on the earth:mountain building, continental drift, atmosphere/ocean heat exchange
      3)atmospheric/surface reflectivity
2.Human Factors
  1)Enhancing the Greenhouse Effect
    -increase CO2 emissions through fossil fuel combustion, and so on.
  2)Land Use Change
  3)Atmospheric aerosols

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