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I think what gets overlooked in all these "bacteria/algae convert CO2 to..." schemes is that it takes energy to do the conversion. That energy has to come from sunlight, and there's only so much energy per square meter to be had. So it's really no different in principle than growing corn or sugar cane and converting it to ethanol, just that the conversion/separation might be more efficient. But no matter what they do, it's still not going to get more than the 1000 or so watts per square meter that's in the sunlight.
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