Humanure/Composting Toilets?

Is humanure, composting toilets a significant source of soil carbon, if it were implemented on a large scale? Is there a carbon sequestration argument to be made for their legality and practice?

It's maybe not phase 1 in terms of most likely for rapid adoption but yes absolutely. Application of compost regardless of the raw materials used can increase carbon sequestration in croplands and grasslands. It would be interesting to look at the admissions from our current sewage treatment practices which I imagine are fairly high and contrast them with the potential of composted human manure applied to productive agroecosystems.