We have hundreds of years of coal reserves right here in the U.S. One day we\'ll likely liquefy it, make it cleaner and power our cars.
We can always expand nuclear power, drill off the outer continental shelf, tap into the geothermal energy of Yellowstone etc.
As for ethanol, 70 percent more energy is required to produce ethanol than the energy that actually is in it. If all the automobiles in the United States were fueled with 100 percent ethanol, most U.S. land area would be needed to grow the corn feedstock.
The most exciting idea being studied right now is the potential to harness tidal power in San Francisco. They hope to build massive turbines underneath the Golden Gate Bridge that capture the power of the tides entering and leaving San Francisco Bay. Hopefully enough to power much of the city\'s electrical needs.
Hopefully battery power will advance to the point where cars can travel hundreds of miles without a charge.