This report is a technoeconomic and carbon intensity comparison analysis of biomethanol (via feedstock switching to biogas, gasification, and power-to-methanol) and potential downstream base chemical products (acetic acid, ethanol, ethylene, propylene, BTX, and gasoline) which form the backbone of the modern chemical industry in turn can be used to produce most conventional petrochemicals, and therefore “green” these value chains. Carbon intensity reductions are valorized in case study scenarios of carbon emissions prices, and break even carbon values are estimated on a regional basis.