ABC News - Car Runs on Nothing But Air

By choosing liquid air, Dearman believes he has created one of the most sustainable cars on the planet. His engine is very light, allowing manufacturers to build a car that could be made cheaply, and, perhaps, out of plastic - no metal required. And by not using any batteries, manufacturers can avoid using any scarce materials.

Soon, his homemade invention will be put inside a very professional package.The engineering company Ricardo, which helps design engines for, among others, McLaren race cars, is creating a state-of-the-art version this year.

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