In 2006 Sony Pictures Classics released the documentary Who Killed the Electric Car? The movie explores the marketing and commercialization of the first electric cars leased in the United States. The California Air Resources Board passed the ZEV mandate in 1990 which required that car manufacturers who wished to sell cars with regular gasoline engines in the state of California to also lease a certain percentage of zero-emission cars. The idea was that more and more zero emission vehicles would be leased and sold in the state over the next few decades, thereby jumpstarting a more ecologically-friendly automobile market. But as the film documents, a number of forces came together that stifled and ultimately stopped the momentum of the zero emissions vehicle market, and the main question the film tries to answer is who killed the electric car and why?