A sixth C123 publication has been published in the journal Journal of Cleaner Production. The manuscript ‘Developing circularity, renewability and efficiency indicators for sustainable resource management: propanol production as a showcase’ by Jordy Motte,Pieter Nachtergaele; Mohamed Mahmoud, Hank Vleeming, Joris W.Thybaut, Jeroen Poissonnier and Jo Dewulf (from UGent and PDC).