by Arnaud Dieumegard and Raphaël Pagé (Obeo) More than 8 million tons of plastic are dumped in the oceans every year. If we don’t take action, in 2050, there will be more plastic than fishes in the oceans! The SeaCleaners association has been founded to provide global, long-term and worldwide solutions for fighting against ocean plastic pollution. The flagship project initiated by The SeaCleaners is the MANTA, the first seagoing vessel capable of collecting and processing in continuous flow large quantities of macro plastic waste floating at the surface of oceans.Its design has been focusing on many innovative technologies in the field of renewable energy production or by limiting her global carbon footprint maximizing the energy self-sufficiency. In this talk we will present a Capella extension developped by Obeo in partnership with The SeaCleaners and Altran to facilitate the Life-Cycle Assessment (LCA) of complex systems. This extension consists of additional concepts added to Capella for inventorying components' physical characteristics and the substances they consume and/or emit. This information attached to the system architecture can be automatically exported as an initial inventory analysis to LCA tools used by environmental experts to perform their impact analysis (such as SimaPro and OpenLCA). Experimented on a MANTA subsystem, we will show how this integration between Capella and LCA Tools accelerates the evaluation of the impacts a system has on its environment, and helps system designers to make architecture decisions that are better for the planet.