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      As is the case with any new product, there are numerous designs for fixing one problem in order to find the best solution. In the case of designing an alternatively fueled vehicle, numerous solutions have been designed; some successful, some not. But the wider variety of solutions that are designed the more likely we are to find a cleaner, renewable source of fuel.

      One noticeable vehicle is the Compressed Air Car - Claims to be the world's cleanest vehicle since all it emits is air. In fact, according to zero pollution motors, the air that comes out of the air is cleaner than the air going in because of its journey through carbon filters.