not really, because tied into the solar panels would be battery and capacitor storage cell. If there were to be a long period of no sun, there would be a problem, but if you were to combine solar panels with wind farms, the supply would even itself out considerably -- all with little or no carbon footprint.

As far as the "use solar for electricity, ethanol for fuel", hybrid and even totally electric cars are getting more and more efficient and cost effective each day, making electricity ALSO our fuel for vehicles.

Clean coal technology, while not carbon neutral, is vastly improved over even several years ago and we (the U.S) are the Saudi Arabia of coal.

Ethanol, clearly, is a huge loser.