Electric Cars = Eco Green Cars….Why??

I see quite a few electric cars running around Coronado touting eco friendliness. Does anybody know why electric vehicles are considered ecologically green? The electric energy to charge the cars comes from a power plant, which also emit greenhouse gasses. This is a concentrated emitter which is much less friendly than a diffuse emitter, and many many power plants are coal fired, and that coal has more emission than oil. Additionally there are transmission losses in the national grid, which are today averaging 7% Pound for pound I doubt if a electric car is any greener than a regular car.