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A comment on How Can We Stop the CO2 That Plants Store from Leaking Back into the Air?. Parent comment

Re:How Can We Stop the CO2 That Plants Store from Leaking Ba... by EGreg on Tuesday April 18, 2023 @01:02PM (#35616693)
Why does building sidewalks need to take up so much CO2?

And why can’t we use other forms of energy to power these machines w electricity?

[ Parent | on HN ]
Re:How Can We Stop the CO2 That Plants Store from Leaking Ba... by bloppe on Tuesday April 18, 2023 @01:20PM (#35616923)
The chemical process of producing cement involves heating calcium carbonate to get lime and CO2. Most of the emissions are from this chemical process, not from transportation or operating machinery, although those usually also contribute quite a bit of CO2
[ Parent | on HN ]
Re:How Can We Stop the CO2 That Plants Store from Leaking Ba... by tcfhgj on Tuesday April 18, 2023 @03:29PM (#35618836)
Why use cement and not cut stones, which live centuries?
[ Parent | on HN ]