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                          Earth System #2 - Energy Budget




Albedo - Arctic
                  GG Warming
                     From Text (Fig. 6-7)




Essentials of Chemical Weathering
100
          Methane
             &
          Ammonia


 75



      ATMOSPHERE                            Nitrogen
       UNKNOWN
 50




 25


                     Carbon                                Oxygen
             Water   Dioxide
  0
             4.5           4                    3      2      1
                         Time (Billion of Years Ago)
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