This webinar will introduce at which degree citizens and other stakeholders are engaged when developing the different methodologies for monetary assessing the contribution of the marine biodiversity (from microbes to megafauna) to people wellbeing. Some examples will be provided emerging from the BIOcean5D project co-funded by the European Union to give answer to policy makers who require start merging those valuations together with other environmental variables into decision-making, also, using to estimate the cost of the environmental degradation, among others.