Using a Tesla S as my example, it requires 85 KW to charge for 265 miles of use.
If the Power plant is coal, it generates 0.69 lbs of CO2 per mile.
If the Power plant is natural gas, it generates 0.39 lbs of CO2 per mile.
If the Power plant is Oil, it generates 0.55 lbs of CO2 per mile.
Using a gas tank of 16 gallons with an average MPG of 35.5, a normal gas car produces 0.55 lbs of CO2 per mile.
We just need to get our power plants onto Nuclear or Renewables!
I used the lbs of CO2 per substance from here:
https://www.eia.gov/tools/faqs/faq.cfm?id=74&t=11
I used the Tesla values from here:
https://forums.tesla.com/forum/forums/how-much-does-it-cost-fully-charge-model-s-85
And my CO2 for Gas Engines from here
http://www.eia.gov/tools/faqs/faq.cfm?id=307&t=11
Agreed