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A comment on Robotic 'trees' can turn CO2 into concrete. Parent comment

Re:Robotic 'trees' can turn CO2 into concrete by raverbashing on Tuesday September 11, 2018 @10:56AM (#17960270)
It seems they're not replacing the quicklime, but the gravel. The left column is confusing, the right column is better.

> A rock particle is coated with our synthetic limestone, forming a carbon-sequestering coating that is 44% by mass CO2.

That's where the CO2 goes, not in curing the CaO

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Re:Robotic 'trees' can turn CO2 into concrete by 08-15 on Tuesday September 11, 2018 @12:08PM (#17960990)
But where does the Ca come from? Obviously not from limestone...
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