How early Earth kept warm enough to support life

[unable to retrieve full-text content]Solving the "faint young sun paradox" -- explaining how early Earth was warm and habitable for life beginning more than three billion years ago even though the sun was 20 percent dimmer than today -- may not be as difficult as believed, says a new study.

Source: http://feeds.sciencedaily.com/~r/sciencedaily/top_news/top_environment/~3/SGRI1knhwZ0/130709155642.htm

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