High-resolution carbon dioxide concentration record 650,000–800,000 years before present

@article{Lthi2008HighresolutionCD,
  title={High-resolution carbon dioxide concentration record 650,000–800,000 years before present},
  author={Dieter L{\"u}thi and Martine Le Floch and Bernhard Bereiter and Thomas Blunier and J-M. Barnola and Urs Siegenthaler and Dominique Raynaud and Jean Jouzel and Hubertus Fischer and Kenji Kawamura and Thomas F. Stocker},
  journal={Nature},
  year={2008},
  volume={453},
  pages={379-382}
}
Changes in past atmospheric carbon dioxide concentrations can be determined by measuring the composition of air trapped in ice cores from Antarctica. So far, the Antarctic Vostok and EPICA Dome C ice cores have provided a composite record of atmospheric carbon dioxide levels over the past 650,000 years. Here we present results of the lowest 200 m of the Dome C ice core, extending the record of atmospheric carbon dioxide concentration by two complete glacial cycles to 800,000 yr before present… 
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