How could the earth produce more oxygen?

After the extinction of all humans and most large animals, what would be the most plausible explanation for arthropods to grow much larger like during the Carboniferous period? Then, the oxygen was much more plentiful due to a lack of decomposing bacteria, but what could cause an increase of atmospheric oxygen in the future to enable arthropods to grow substantially in size?

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How could the earth produce more oxygen?

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