i think they are being we have the technology to run cars off of water now. he is a link to a video aswell.
http://www.youtube.com/watch?v=vKM4pb9Oxrg
Cars can be powered by gas,Diesel,water,vegetable oil, and even with oxygen. Ooooo never thought of that huh?
If you listen closely he says "water - water and electricity" and when he's showing his car says it COULD run on water but he's running it as a hybrid on water and gasoline - why would he do that if it can just run on water? Just possibly it's not ready for prime time yet?
There are likely to be lots of other energy sources developed over time, and very likely fairly soon. There are electric cars sold commercially now - but their range is severely limited in the best of conditions, running without using such luxuries as lights and air conditioning.