Water is the only bi-product expelled from the exhaust of UK manufacturer Riversimple's hydrogen-powered electric vehicle.
Riversimple's Rasa prototype, which is reportedly capable of travelling 300 miles on a full tank of hydrogen, was designed to be as ecologically friendly as possible.
The vehicle incorporates an interior trim made from recycled plastic bottles and lightweight materials such as a carbon-composite chassis.
"I always like it when technology is pushed to its limit," designer Chris Reitz told Dezeen. "Looking globally at what kind of cars are on the market and what technology is available, I think we really are pushing it to the limit."

Compressed hydrogen is stored in a tank at the rear of the two-seater vehicle. When the vehicle is in motion, hydrogen passes through a small fuel cell where it reacts with oxygen to generate water and electricity. The electricity drives the motors positioned in each of the four wheels, which are also designed to recover half of the energy produced when the vehicle is braking.
Recovered braking energy is stored in a compartment at the vehicle's front, and then served back to the electric motors for a boost in acceleration when needed.

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