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Not my area of expertise, but I would assume that there is an efficiency limit, much like there is for solar panels.

Remember that organisms can't just pull CO2 out of the air for free. Plants do it via photosynthesis, which requires the sun's energy. There is a maximum amount of energy falling on each organism, and I would guess that there is some theoretical limit to the efficiency of photosynthesis that is well below that limit.

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Yup I agree with you almost entirely. The only thing I was thinking of was if evolution would optimize for the amount of energy a plant receives vs other things like survival, reproduction etc and how much efficiency we can gain by optimizing purely for photosynthesis.

Also I don’t know if plants are adapted to the high CO2 atmosphere yet so even if evolution optimized the ability of a plant to photosynthesize, given this happened in relatively low CO2 environments like forests and without man made climate change, it’s possible that human intervention can improve it.

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