As allocation can be a controversial aspect of the LCA methodology due to its partially subjective nature, careful consideration is required when deciding which of the investigated allocation scenarios is most justifiable. Currently, all three terpene streams of interest are of similar economic value, as both pure and mixed desulphurised monoterpenes are widely used in lower value applications such as industrial solvents, adhesive resins, 75 insecticides 76 and fragrance and flavouring agents. Given that there is significant research into valorisation of both purified and mixed monoterpene streams for higher value applications, including their use as therapeutic agents or as feedstock for fine chemicals production, it is likely that the economic value of the different terpene product streams also remains comparable in magnitude in the future. Additionally, these research efforts suggest that various monoterpene sources may be able to substitute benzene and other petrochemical-derived feedstocks used in specialty chemicals production in the future. It was thus judged as likely that mass-based allocation of CST separation impacts to all three monoterpene product streams is justifiable for future applications.