The primary aim of GreenCarbon 2020 is to increase dissemination of the research activities conducted within the GreenCarbon European Training Network (project H2020-MSCA-ITN-721991). Furthermore, GreenCarbon 2020 is also open for the global research community. Contributions in the form of oral presentations and posters are greatly appreciated and welcomed. The topics covered during the symposium include, but are not limited to: Production and characterization of biomass-derived carbons; synthesis of biomass-derived porous carbons and their application in adsorption, catalysis and electrochemical energy storage; biomass-derived carbons for soil conditioning (biochar); and other emerging applications of biomass-derived carbons.