After 7 years of intensive research on this topic, this is the best solution I've come across so far to clean up the mess we've created:
www.thezeitgeistmovement.com/

We have had 100% water, hydrogen / oxygen powered vehicles for many years now. It's up to us to protect the inventors, fund them and stand up to the oil companies / governments so that we can all enjoy cheaper travel and better health through CLEANER AIR. Thanks for your interest and for sharing this important information. Look up "water car" and "Stanley Meyers" on youtube and google for a taste of what is available for us right now.