Conservation agriculture: farming carbon into soils?

One-third of the atmosphere’s post-industrial CO2 does not derive from fossil fuel combustion but from the degradation of soils, where organic carbon has fallen from 4% to 1-2% due to mechanized agriculture. Conservation agriculture rebuilds soil carbon. It can sequester 3-15 bn tons of CO2 per year, generating carbon credits, while restoring loss-making farmlands to exceptional profitability. Fertilizer demand would be decimated.