Faint young Sun paradox remains.

@article{Goldblatt2011FaintYS,
  title={Faint young Sun paradox remains.},
  author={C. Goldblatt and K. Zahnle},
  journal={Nature},
  year={2011},
  volume={474 7349},
  pages={
          E3-4; discussion E4-5
        }
}
Arising from M. T. Rosing, D. K. Bird, N. H. Sleep & C. J. Bjerrum, , 744–747 (2010)10.1038/nature08955 The Sun was fainter when the Earth was young, but the climate was generally at least as warm as today; this is known as the ‘faint young Sun paradox’. Rosing et al.1 claim that the paradox can be resolved by making the early Earth’s clouds and surface less reflective. We show that, even with the strongest plausible assumptions, reducing cloud and surface albedos falls short by a factor of… Expand

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