The other side of the coin
I like the concept of electric cars. They are a good idea, but they bring their own host of problems.

At this point, they aren't in widespread use. According to Wikipedia, in 2006 there were about 53,500 in use in the US in 2006 with a total of about 250 million registered cars. That's about 0.02% of all registered cars.

So it begs the question: what will happen when, or if, electric cars become overwhelmingly popular? The major issue is that they would strain an already overburdened and aging electrical grid.

Switching all the cars to electric would greatly reduce CO2 emissions from cars, but we'd need more capacity from the electrical grid. And, at this moment, that means more coal plants which also emit CO2. Overall, it would still be a net reduction, but it's nowhere near the win situation that some people wish for.

Electric motors are more efficient than gasoline motors, but cars are heavy. So, cars have to be made lighter in order to truly reap the benefits of electric motors. This creates issues with traffic accidents. A lot of work is being done on improving materials and safety, but it is a definite risk for highway driving.

And, finally, what would happen to all the batteries? They aren't exactly bio-friendly. We'll need a better recycling program than we have now.

Despite this, electric cars are a good alternative to gas, and they are getting better. So, I'm looking forward to seeing how this works out.