http://www.theaircar.com/
"Welcome to the future!
It´s already looking like the MDI Air Car will be one of the major technological discoveries of the new century. Inventor Guy Négre has developed a car capable of a top speed of 110 km/h, 300 kilometres on one tank of fuel and at a cost of just a penny per kilometre. All of this at "zero pollution". In fact the car cleans the air it uses!
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Will the air powered car be the next revolution in automobile technology? Amazingly, it runs on compressed air. Its exhaust is actually air that's been filtered and cleaned so its exhaust is cleaner than the air that it uses.
"This represents a true revolution in automobiles - it is the first time that a car has produced minus pollution, i.e. it elimates and reduces existing pollution rather than emitting dirt and harmful gases. The exhaust pipe on the MDI cars produces clean air" http://www.theaircar.com/tecno.html
Less carbon dioxide emissions will result in less acid rain, and healthier reefs. Ok, I'm stretching it a bit in order to make this reef related. I hope this is not a joke. It sounds too good to be true.