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> biological bootstrapping is negligible

Plastics use carbon, steel is carbon in a large part, lubricants use carbon, batteries use carbon, motors use carbon.


* Bioplastics are recyclable

* Steel is < 2% carbon (not "a large part"), and steel can be replaced with other materials

* Lubricants are used in trivially small amounts

* Most battery do not use carbon

* Electric motors do not use carbon


Eh, steel doesn't have all that much carbon. Most of the steel would be structural, which tend to be 0.05 to 0.3% carbon. "High Carbon Steel" is around ~1%.




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