We know how plants make oxygen, why can’t we automate that process and not worry about losing plants?
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It is trivial to do. Run DC electricity to two electrodes in water and you split it into hydrogen and oxygen. There are many different DIY designs in this video [https://www.youtube.com/watch?v=d85OX6yEwE0](https://www.youtube.com/watch?v=d85OX6yEwE0)
The huge problem is that we need a lot of electricity.
Even if we could make all oxygen plants provide another very important function. They produce plant matter that animals including humans eat.
If no more oxygen was produced and there was a magic food source for all living to exit like they do today there is enough oxygen to last 5000 years. For just all humans we talk about half a million years. We also need something that gets rid of all carbon dioxide that would be produced but not used up by plants. In an enclosed space you die of CO2 poisoning not lack of oxygen, the same would be true for eath.
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