No climate paradox under the faint early Sun

@article{Rosing2010NoCP,
  title={No climate paradox under the faint early Sun},
  author={Minik T. Rosing and Dennis K. Bird and Norman H. Sleep and Christian J. Bjerrum},
  journal={Nature},
  year={2010},
  volume={464},
  pages={744-747}
}
Environmental niches in which life first emerged and later evolved on the Earth have undergone dramatic changes in response to evolving tectonic/geochemical cycles and to biologic interventions, as well as increases in the Sun’s luminosity of about 25 to 30 per cent over the Earth’s history. It has been inferred that the greenhouse effect of atmospheric CO2 and/or CH4 compensated for the lower solar luminosity and dictated an Archaean climate in which liquid water was stable in the hydrosphere… 
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