Carsten Rühlemann is a researcher at the MARUM research centre at the University of Bremen in Germany. Researchers at MARUM study the oceans’ impact on the planet. Mr Rühlemann works in the Marine Geology division, specializing in ocean currents and their interaction with global climate. He has recently been studying the importance of alkenones in oceans. Mr Rühlemann has also worked extensively on the reconstruction of past surface and deep-ocean currents.