As the climate targets for passenger cars are likely to be massively missed, a group of researchers is calling for an immediate and comprehensive revision of the EU’s CO2 fleet legislation. This is the central message of the white paper „CO2 emission regulations for passenger cars“ from the International Association of Sustainable Drivetrain and Vehicle Technology Research (IASTEC). The paper was largely written by Thomas Koch, Head of the Institute for Piston Engines at the Karlsruhe Institute of Technology (KIT).