There are some ice age threads going on right now.
No one responded to this when I originally posted it, so I thought that I would enhance it some.
The debate:
scienceweek.com...
More:
Geologists agree that prehistoric Earth was locked in a deep freeze during Precambrian times, about 750 to 600 million years ago. They disagree
over the severity of the glaciation.
www.astrobio.net...
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