One big problem is that most people (at least in the US) don't want electric cars even though the cost of gas is so high. One of the biggest (in fact, I believe the biggest) car manufacture in the world, General Motors, just recently cancelled their EV1 car. The EV1 was their first in a line of electric production cars that they were going to sell. It was cancelled before even one year of production due to a lack of demand. Despite the cost of fuel, many still don't want to switch.
Plus, a lot of people have figured out that driving their old "gas guzzler" is cheaper than buy a new car. I know someone who doesn't have all that much money and he calculated it all out and found that he pays $200 per month for gas to drive his car, which he has had for a long time and dispite its age has kept it reliable. According to him, it would be much more expensive to buy a new car and have a car payment than to just buy the gas his current vehicle requires.
Nuclear power plants?
There aren't that many nuclear power plants in the world, and many people don't want them due to the risks. I feel that they are a great souce of power, much better than daming rivers and burning coal, but there have been a couple accidents in the past that make them undesirable.