The ideal power source is low cost and with no pollution. The hydrogen fuel idea is not a new one. Iceland and Denmark have been using hydrogen to power their public transportation. Honda is pushing home hydrogen production units for their hydrogen cars. The 202 Colabortive company is using algae to produce hydrogen. The hydrogen fuel cells after the energy is released only exhaust pure water vapor. Honda's 2008 proto-type vehicle looks very futuristic. The Honda Clarity sold in California is a little more casual to help the public be more receptive to the change. I love the future design idea myself.