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A comment on Adding Crushed Rock to Farmland Pulls Carbon Out of the Air. Parent comment

Re:Adding Crushed Rock to Farmland Pulls Carbon Out of the Air by mschuster91 on Wednesday October 25, 2023 @05:59PM (#38018931)
> Clearly the solution is... build roads from olivine! :D Collectively, roadways are "naturally" subject to a huge amount of mechanical weathering, which currently mostly just generates asphalt microplastics.

Nah, asphalt microparticles are in the end just very viscose oil and rock dust from the filler. The microplastics from roads come from tire wear and brake dust.

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Re:Adding Crushed Rock to Farmland Pulls Carbon Out of the Air by schiffern on Wednesday October 25, 2023 @06:17PM (#38019060)
>asphalt microparticles are in the end just very viscose oil

Bitumen is plastic. In fact there's increasing efforts to use post-consumer recycled plastic as an additive.

Microplastics from road transport mainly come from tire dust, but also include road markings (plastic mixed with glass microbeads), bitumen from asphalt, and a bit of brake dust.

https://www.sciencedirect.com/science/article/pii/S004896972...

https://resourcelab.dk/plastics/pollution/oceans/2018/10/11/...

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