"Marc" <jac### [at] wanadoofr> schreef in bericht 
news:45096da5$1@news.povray.org...
>
>
> You mean no life on dry land but may be a lot underwater... blue algae and
> cyanobacteriae could be at work for ages yet
> But it is true that the atmosphere was not so oxygenated than after the
> carbonifer era which fixed most of the carbon dioxid we are releasing back
> now.
> If I'm wrong, please correct me :-)
>

Yes, I stand corrected. Of course, I mean no life on dry ground! I was swept 
along by the rethorics!
Indeed, the emergence of land plants was the main factor for the atmospheric 
oxygen and a substantial lowering of carbon dioxide.

Thomas

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