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1 facility for every ~100k people isn't unreasonable. It's like building an air treatment plant for every water treatment plant there is. Anyway, while these plants are busy reprocessing the entire planet's atmosphere they can do other useful things besides removing CO2.

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That gives an interesting sense of scale to the problem. Dealing with C02 emissions is similar to water waste treatment, both in concept and in scale of infrastructure required.

Interested to know what those "other things" might be.

Any activity with carbon that doesn't involve aerobic activity. Creating soil (worms or bokashi vs compost), creating plastic, creating pencil lead.

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