I was under the impression that commercial CO₂ was produced by mining chalk. | Hacker News

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wizzwizz4 53 days ago | parent | context | favorite | on: So you want to use plants to reduce CO₂

I was under the impression that commercial CO₂ was produced by mining chalk.

t0mpr1c3 52 days ago [–]

Yes, lime kilns use the reverse process -- heating chalk to drive off the CO2.

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