Atmospheric homeostasis by and for the biosphere: the gaia hypothesis

  title={Atmospheric homeostasis by and for the biosphere: the gaia hypothesis},
  author={James E. Lovelock and L. S. Margulis},
  journal={Tellus A},
During the time, 3.2 × 10 9 years, that life has been present on Earth, the physical and chemical conditions of most of the planetary surface have never varied from those most favourable for life. The geological record reads that liquid water was always present and that the pH was never far from neutral. During this same period, however, the Earth's radiation environment underwent large changes. As the sun moved along the course set by the main sequence of stars its output will have increased… 

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