Sorry to burst your bubble about the hydrogen economy, but nobody seems to be paying attention to the huge amount of energy needed to obtain hydrogen, and then compress it to thousands of pounds per square inch. We can get hydrogen by chemical reaction from natural gas losing energy in so doing, or by electrosis of water consuming much energy. Now if we used renewable energy to provide the electricity for electrosis this "sounds" neat. But, all of you are grossly underestimating the huge amount of electicity required to bring this about. And then much more power is needed to compress it. I'd like to see a chemical engineer, chemist, or physicist calculate the total energy needed to produce enough energy to drive the Chevy Volt 40 miles. And we haven't even discussed the cost of building the infrastructure yet.

Why so many negative comments? Will be powered by coal (only for certain parts of country. A large generation plant can much more easily have pollution controls and carbon sequesterization than millions of individual point sources, i.e. cars. Why no solar panels on the roof? Because they are frightfully expensive, and the amount of power such a small surface area could collect would be miniscule. But hey, if they become economically feasible, Volt 2.0 will have them. It is only a "sports car", well GM has said that the architecture will support many other vehicle types. I'm sure that they wanted to come out with a beautiful automobile to contrast to the supremely ugly Prius. Ugghhh! The grid can't support it. Wrong, yest it can. If recharged off peak at night many studies have shown that the grid can support literally millions of vehicles with no new power plants. Finally, the standard refrain, "This is THE answer". Folks, we need many answers to solve the environmental and petroleum dependency of our current transportation system. The Volt is an elegant and practical start. Give it a rest with the negative comments. If Toyota was doing this you negative folks would be swooning.