I think there are a lot of people that are not considering how much weight and air resistance will affect the number of miles between charges and charge times required to get back on the road. Imagine what the effects will be on the already overloaded power grid not to mention what it will do to the cost of electricity, shortages of natural resources, and the amount of new forms of pollution that will be created. Solar as a electrical power source will help but so far nuclear power seems to be the only solution for the large amounts of cheap electricity which will eventually be required. We haven't done very well managing the planets resources in the past and it seems we are awfully slow to learn. The real problem is a cheap non polluting source of power and it's distribution.