>The main sources of energy in the United States are still oil, coal, and natural gases. This is a problem that cries out for math. On average, the CO2 intens

>The main sources of energy in the United States are still oil, coal, and natural gases. This is a problem that cries out for math. On average, the CO2 intensity of US electricity is 690 g/kWh. This makes the Model S the CO2 equivalent of a car getting 37 mpg. This is a lot higher than comparable cars. Of course CO2 isn't the only pollutant. It would also emit 0.43 g/mi of NOx (blowing the limit by nine times), 0.011 g/mi of NMOG (1/7th the limit), 0.015 g/mi of PM10 (the limit is 0.01 g/mi), and 0.13 g/mi of CO (a miniscule 1/27th of the limit). So it's a mixed bag. Caveat: I used the average US energy mix, but electricity production is highly regional. Here's a map Tesla made regarding pollution from electricity: http://www.teslamotors.com/goelectric#electricity http://www.teslamotors.com/goelectric#electricity Some states also let you choose where your power comes from, and of course rooftop solar is currently available (unlike rooftop oil wells). Sources: http://www.epa.gov/cleanenergy/energy-resources/refs.html http://www.epa.gov/cleanenergy/energy-resources/refs.html https://www.dieselnet.com/standards/us/ld_ca.php https://www.dieselnet.com/standards/us/ld_ca.php http://www.nrel.gov/docs/fy07osti/38617.pdf http://www.nrel.gov/docs/fy07osti/38617.pdf