Why Early Earth Didn't Freeze Over Still a Mystery (LiveScience.com)

[unable to retrieve full-text content]LiveScience.com - Global warming gases cannot explain why Earth was not frozen billions of years ago when the sun was cooler, researchers say.

Source: http://us.rd.yahoo.com/dailynews/rss/environment/*http%3A//news.yahoo.com/s/livescience/20120305/sc_livescience/whyearlyearthdidntfreezeoverstillamystery

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