How clean are electric vehicles?

The Union of Concerned Scientists has a new report out on their analysis of electric vehicles and how they perform over time in terms of pollution. This report deals with some questons that keep coming up, such as: What about the source of the electricity? Does it make sense to drive an electric vehicle powered by coal vs. solar or hydro power? The interactive website allows readers to make calculations depending on where they live. In all, it's good news for the electric vehicle industry.