(left) A car that runs on compressed air (like a scuba tank) available this summer, from 12,700 USD in taxi form in India. Includes an on board air compressor so you can charge it from the mains in 4 hrs, or from a custom air compressor at a 'gas' station in 3 minutes, and it will go for 125 miles. Well, why not? TATA is the conglomerate behind it. (right) This car has Solar panels on the roof, pedals in the front seats, is made of carbon fiber and does 150 miles to the gallon (because it is so light). Available from 2012, for 20,000 USD.