As the world moves toward carbon neutrality, motorsport has also been pushed to look at alternative solutions to petrol and diesel. Hydrogen, the most abundant element in the universe, is an attractive fuel source that some are looking to as a viable alternative to petrol for racing. To create power, hydrogen can be used mainly in one of two ways: internal combustion or fuel cells. Theoretically, the only by-product from either method is water, making it a genuinely ‘green’ fuel.