Talking of studies I think it might be worthwhile to raise the interesting study carried out by Volvo to compare the carbon impact of EV's against ICE cars. The reason this study is so useful is because they have a car that is available in both EV and ICE but is made on the same production line using virtually all the same components apart from the means of propulsion. Its worth bearing in mind that this is a Volvo study, a manufacturer committed to being an EV only producer and probably the most socially conscious car manufacturer out there.
On this thread people have correctly pointed out that EV cars are not without their serious environmental problems due to the nature of battery production. I'm an advocate for EV's but have said all along they are not environmentally friendly, no private car can ever be.
The study basically found that in the worst case (where you solely recharge it in a country with a filthy electricity grid) it will take up to 90,000 miles driving in an EV before it becomes less carbon intensive than an ICE car. If you are in a country where there is a fair mix of renewable energy (such as the UK) it will be just over 50,000 and if you can solely use renewables its closer to 30,000.
Obviously this doesn't account for the immediate impact on air quality especially in urban areas.
My take from this is that we need to give up on the hope that some alternative fuel will appear and it will be the panacea that will solve all our problems and we won't have to change our lifestyle in anyway. EV's are not going to fix everything nor is Hydrogen or synthetic fuels. It ain't going to happen.
Anyway link here to a description of the report but there are plenty other reports out there:
Volvo says electric car making emissions are 70% HIGHER than petrol