Earth's early atmosphere

@article{Kasting1993EarthsEA,
  title={Earth's early atmosphere},
  author={James F. Kasting},
  journal={Science},
  year={1993},
  volume={259},
  pages={920 - 926}
}
  • J. Kasting
  • Published 23 January 1987
  • Environmental Science, Physics, Geology
  • Science
Ideas about atmospheric composition and climate on the early Earth have evolved considerably over the last 30 years, but many uncertainties still remain. It is generally agreed that the atmosphere contained little or no free oxygen initially and that oxygen concentrations increased markedly near 2.0 billion years ago, but the precise timing of and reasons for its rise remain unexplained. Likewise, it is usually conceded that the atmospheric greenhouse effect must have been higher in the past to… 
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