EASY-SQUEEZY:

Vehicles fueled by hydrogen are much more energy-efficient than those powered by fossil fuels, and they only emit water vapor and warm air. But these vehicles need special battery-like devices called fuel cells to drive their motors.

Not anymore. Researchers in Australia have retrofitted diesel engines to run on 90 percent hydrogen as fuel, emitting 86 percent less carbon. [...]

Retrofitting existing diesel engines should be faster and easier. So mechanical and manufacturing engineering professor Sanghoon Kook and colleagues at The University of New South Wales in Sydney modified a car-sized diesel engine by adding a hydrogen injector to it along with its original diesel injector.

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