It's a hydrogen generator system that injects small amounts of hydrogen gas, on demand, into the combustion chamber of a vehicle's engine.

Not yet, but future technologies might allow hydrogen -only engines.

These include separation and purification, transport, and low-carbon sources of heat, electricity, and energy-carrying materials such as hydrogen. Because the needs of carbon utilization processes are still emerging, a specific research agenda for these enabling technologies and resources is unclear.

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