The global fight against climate change has been largely discussed for years now. But still there are a lot of unsolved problems. In the faculty’s new video series “A coffee chat with…” Professor Marc Oliver Bettzüge gives some explanations and evaluates in what sense German energy policy contributes to reducing global CO2-emissions. Marc Oliver Bettzüge is a Full Professor of Economics and Director of the Institute of Energy Economics (EWI) at the University of Cologne. (Interview by Jennifer Garic & Kristina Wollseifen)