Adaptation to high $\mathsf {CO}_2$ concentration

If humans were to live in an earth-like planet with an atmosphere with a significantly higher concentration of $\mathsf {CO}_2$ (Higher than what can be tolerated by normal human for a long period of time, but otherwise with the same concentration of oxygen), what sort of modifications would they need in order to survive, assuming that they have the technology to alter DNA and their own bodies, but with no external breathing apparatus?

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Adaptation to high $\mathsf {CO}_2$ concentration

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