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Is it possible to seperate O2 from CO2 and use it for energy In Human? Why Plants and not Humans can do it?

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  • $\begingroup$ It's possible, though complicated, and I believe is done on the ISS. I'm not really up on the exact method, but searching NASA web sites should provide info. The problem is that it takes energy to do the separation, as explained in the answer below. $\endgroup$
    – jamesqf
    Commented Apr 29, 2017 at 19:27

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Most energy in humans is generated by reducing O2 to water and CO2, using something like sugar or fat. Converting CO2 into oxygen would require energy, not generate it.

Plants do have mechanisms to convert CO2 into oxygen, but they use light as an extra energy input to push this energy-costing process.

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