Today's chemical system uses >99% fossil feedstocks, but by 2050 this declines to 42% (LC-ME) or more radically to <10 % (LC-NFAX and HC-NFAX) or 0% (HC-NFS), reducing cumulative emissions by about 20% (39-41 GtCO2eq). Naphtha consumption drops most steeply (75-95% in LC-ME and LC-NFAX), due to the electrification of road transport and the consequent retirement of catalytic reforming, which produces approximately 85% of aromatics today. This is closely followed by coal (70-93% in LC-ME and LC-NFAX), which is disadvantaged in the model due to its higher emissions intensity and costs.