re: Good question.
"Note that most of the rest of the mix is natural gas, and only 1 percent is coal. Of course, these numbers would be very different in other parts of the country."
Yeah like in al Gore's state. As in the link I provided above shows:
http://www.lesjones.com/posts/005045.shtml
Where 66% of electrical energy comes from Coal, and if not for the 20% coming from Nuclear power, their 1495 lbs of CO2 per MWh would be even higher- plus the high levels of SO2.