Comment by defrost

> I didn't realize that a "green" carbon atom is different from a regular carbon atom.

Easy mistake to make, don't beat yourself up over it.

It's not the individual carbon atoms that carry the signature, it's the atoms in bulk that give the story ... eg: 6 x 10^23 carbon atoms

See: https://pmc.ncbi.nlm.nih.gov/articles/PMC7757245/