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Originally Posted by The_Heretic
Doesn't seem to say, having checked the link. But- assuming it's no photosynthesis, there are other basic chemical compounds which microbes could turn into metabolic energy, hydrogensulfide for instance.
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Possibly, but to start absorbing large amounts of CO2 to be in anyway useful you are going to need some significant energy source whether it be direct (light) or chemical. Hydrogen sulfide is going to have to come from some sort of organic decomposition. Perhaps the artificial organisms aid in that breakdown.