German electric utility executive Fritz Vahrenholt is co-author (along with geologist Sebastian Lüning) of a book expressing 'skepticism' regarding the human contribution to global warming, which predictably has been trumpeted by the usual climate denial enablers. Why should we particularly care what Vahrenholt thinks about climate science? That is something of a mystery - he has a PhD in chemistry and has worked in the energy sector for Shell Oil and wind turbine maker RePower. Vahrenholt and Lüning both currently work for RWE Innogy, Germany's second-largest energy company (Vahrenholt as a manager, Lüning as a scientist in its oil and gas division).