TUM Study: EU's Tailpipe CO₂ Rule Punishes Green Steel and Circularity

The Technical University of Munich (TUM) has raised a fundamental objection to the EU’s current CO₂ regulation for vehicles, arguing that the exclusive focus on tailpipe emissions is not just outdated but actively counterproductive. According to TUM researchers, the tailpipe metric fails to acknowledge—and in effect penalizes—the use of green steel and circular manufacturing processes, which are crucial for reducing the automotive industry’s true carbon footprint.

By using a single metric based solely on exhaust emissions, the regulation ignores the significant emissions that occur during vehicle production. As a result, automakers who invest in low-carbon materials and closed-loop recycling systems receive no regulatory credit, and may even face higher compliance costs. This, TUM argues, undermines the very incentives needed to finance the transition to sustainable manufacturing.

The study calls for a more holistic approach to CO₂ measurement, one that incorporates lifecycle thinking. TUM’s critique adds to a growing debate over how to design regulations that foster innovation across the entire value chain, not just at the tailpipe. The findings challenge both EU policymakers and industry leaders to reconsider the metrics they use to judge environmental performance.