Fiat Pandas

The Fiat Panda Hydrogen concept car originally appeared in 2006, but has made the trip to Copenhagen with a number of other cars ahead of the upcoming climate summit.

For those interested, the fuel cell stack sends power straight to the motor without the need for a battery, and it produces 54hp and a top speed of 81mph, with a range of 125 miles. And using Hydrogen, the only waste product coming out of the exhaust is water.