Ensuring a secure and sustainable supply of critical raw materials : recommendations on how to take forward the EU Commission's proposal for a Critical Raw Materials Act / by Jan Kosmol, Oliver Weber, Regina Kohlmeyer, Carsten Alsleben and Jörg Rechenberg (German Environment Agency, Dessau-Roßlau) ; on behalf of the German Environment Agency ; responsible unit: Section III 2.2 Resource Conservation, Material Cycles, Minerals and Metals Industry