In some ways, the uncertainty over supply consistency is really a form of risk management. In the future, both petrochemical supply and renewable supply will carry increased risk. For petrochemicals, further supply uncertainty may arise from political changes in other world areas. For plant-derived materials, weather may be an uncertain factor locally, while specialty plants with less commodity type production may result in more trading uncertainty. These are not necessarily "killer" issues but will require considerable attention to ensure economic viability within the evolving infrastructure
