Big excitement today as Nissan showed off the TeRRA FCEV concept that it's going to bring to the Paris Motor Show later in September.

What's an FCEV I hear you ask? Simple, it stands for Fuel Cell Electric Vehicle. What's a fuel cell then? Even simpler; it's like a battery that uses fuel. You put hydrogen in, it gets combined with oxygen, which generates electricity that goes to turn the wheels and power the car. And the only thing that comes out of the exhaust is water. How? Because if you combine hydrogen (H) and oxygen (O2) you get H2O – water.