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Suppose all of those mitigations in your second paragraph are true. If phytoplankton die off in meaningful amounts, where will we get our oxygen?

We have thousands of years of oxygen banked in the atmosphere so it's not an issue on the same time scale as co2

Thanks! Since this was not obvious to me (and maybe isn't to others) here's a summary that cleared things up for me: https://blogs.nicholas.duke.edu/citizenscientist/oxygen-in-t...