Should we ban gasoline cars?

As electric vehicles become commercially viable, they have the potential to yield dramatic reductions in air pollution. The UK plans to have no gasoline vehicles by 2030, Norway by 2025, and California by 2035. But what is the best policy to achieve that? Is banning an effective option? Stephen P. Holland, Erin T. Mansur, and Andrew J. Yates provide a framework for assessing costs and benefits, elucidating key unknown parameters, and designing effective policies to discourage the use of gasoline.