In America and around the world, millions of people think electric vehicles (EVs) are the solution to all kinds of environmental problems---like smog, fine particulate pollution, and global warming. Save the planet! Drive a Leaf (or Volt or Tesla or ... the models multiply). But enormous technical problems face the transition from gasoline- or diesel-powered to battery-powered vehicles. Those problems are all rooted in one issue: energy density (energy stored by volume). Cubic inch for cubic … [Read more...]