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Keywords:

  • early Earth;
  • Archean;
  • paleo-climates

During the Archean eon, between about 3.8 billion years ago and 2.5 billion years ago, the Sun was about 20%–25% fainter than it is today. With less sunlight to warm the Earth, the oceans should have been frozen over, but geological evidence suggests that this was not the case.