Q. Will electric cars actually reduce emissions?A. Short answer: Yes.
Longer answer: Yes, because electric cars use energy so much more effieicently than gas cars do, even if an electric car is charged from electricity coming 100% from a coal-power plant, the overall resulting CO2 is less. Plus, you get the huge benefit of clean air in urban enviroments.
Very long answer showing stats and math to back this up: Visit http://www.pluginamerica.org/learn-about-plug-ins/frequently-asked-questions.html#Q2 and be sure to click the "read the summary" link.