>> Maybe not. I've reported a study that says there is not enough carbon
>
>> buried if
>> the atmosphere was the CO2 that the new scenario suggests.
>> So we may be back to the Miller experiment atmosphere.
>>
>
>It's still a good assumption. Most planets have reducing atmospheres, being
>
>formed that way when the star systems are formed.  It's hard to imagine
>how 
>a planet can convert to an oxidizing atmosphere without the presence of
>
>organisms such as anaerobic bacteria. 

You might be interested in reading the July 2003 Astronomy article:
"Mysteries of atmospheres revealed" . Naomi Lubick.

"Recently, however, researchers have begun to reassess the prominence of carbon
dioxide in the development of the early atmosphere of our planet ...
the currently unobserved CO2 should be trapped in the geologic record in the
form of siderite ... but it hasn't been found in ancient soils, leading
researchers to hypothesize that there wasn't enough CO2. This geologic proof
has led reseachers to think some other gas might be responsible for warming
Earth in its youth."
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