In order to answer that we need to know where it gets the electricity to recharge its batteries. Also, we need to know where the spent toxic batteries will be disposed of.
The batteries are obviously recycled appropriately. They last a long time and are easily identified, they have a car attached. They aren't double A's.
The eia has the info on emissions.
How much carbon dioxide is produced by burning gasoline and diesel fuel? - FAQ - U.S. Energy Information Administration (EIA)
"How much carbon dioxide is produced by burning gasoline and diesel fuel?
About 19.64 pounds of carbon dioxide (CO2) are produced from burning a gallon of gasoline that does not contain ethanol. About 22.38 pounds of CO2 are produced by burning a gallon of diesel fuel."
The electric auto produces no emissions.
The eia also has info on co2 per kw for different methods of generation.
How much carbon dioxide is produced per kilowatthour when generating electricity with fossil fuels? - FAQ - U.S. Energy Information Administration (EIA)
Hydroelectric produces none. So that's an easy calculation.
The others a bit more complicated.
We can rough out the solution without it, though.
An electric car with solar produces none.
An electric car with coal produces some.
The difference betwen the two is the generation method, so it's not the car that is the causal factor.
An inernal combustion engine produces it regardless of how electricit is generated on the grid. It is the causal factor.
I think the idea of the electric vehicle is that it s one link in a chain. It solves one of the issues.