I really wish the writers of these kinds of articles would take a moment to look at the promise of electricity, rather than borrow problems predicted by "studies" paid for by who-knows-whom. Electricity can be made cleanly, and is used cleanly. Gasoline, by contrast, cannot be made cleanly, and puts out nineteen pounds of carbon per gallon burned, whether by Porsche or Prius. In 100 years of improvements, the best pollution characteristics we have achieved with gasoline cars pale in comparison to the possibilities of electrics, where renewable energy sources hold out real hope of all-but non-polluting transportation.