When CO2-levels are to low plants start to photorespirate instead of photosynthesise. This cost them losses in energy, and adds CO2 to the atmosphere instead of O2.

I wonder if the photorespiration is entirely "bad" for the plant or is there any beneficial outcome as well?

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    $\begingroup$ Honestly, I do believe that photorespiration has hidden advantages for plants. Yet, the answers to this question will most likely be primarily opinion-based. $\endgroup$ – another 'Homo sapien' Sep 8 '17 at 13:12

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