Producing oxygen without plants

Obviously, current oxygen levels should last us years, so we are talking about a long-term solution.

Also, in this hypothetical scenario, plants have stopped releasing oxygen but haven't stop producing organics, so the food is not a problem. I understand it's a far-fetched scenario, but I don't know how else to focus the question on oxygen production specifically.

If plants stopped releasing oxygen, how could we produce oxygen for breathing, and how sustainable and effective would these methods be?

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Producing oxygen without plants

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