A pair of economists, one with the University of Calgary, the other, the University of California, along with a civil engineer from Carnegie Mellon University, is suggesting in a Comment piece in the journal Nature, that electric vehicles (EVs) need to be lighter if they are to replace gasoline-powered vehicles. In their paper, Blake Shaffer, Maximilian Auffhammer and Constantine Samaras suggest that the added weight of EVs makes them less safe and less efficient and therefore less economical. In their paper, the authors note that climate change has put EVs on a path to replace cars powered by gasoline. But...