Re: Where will the power come from?
The point is that the power source is getting worse right now - by importing dirty power (and building more dirty power plants). You cannot claim green creds with one hand and spend them with the other.
We must also consider the batteries which can (in their manufacture and disposal) be highly polluting. So any gains that might be gained are offset by that as we can't just consider the "greeness" at point of use, it must be from cradle to grave.
We already have technology right now that could be put into use, we've had it for decades. But our government officials are too busy helping their pals trouser tax-payer money than deliver an efficient and reliable service. Which would also address your air quality issues.
I am continually amazed at mass transit in other countries. Clean (inside and exhaust), fair (and understandable!) prices and reliable. Meanwhile in the UK unless you book six blue moons in advance on a Tuesday whilst wearing green boxers, you will get gouged and still not be sure which trains you can get on at the station because your ticket might not be valid on that service from A-B, even though it runs on the same tracks from the same operator.
It's a farce and with current tech e-cars are simply an answer looking for a problem as there are still other solutions to personal transport. "Boris bikes" (to pick one). Cure the obesity epidemic and pollution in one!
More joined-up thinking, less joined-up PR puffery and tax-payer milking.