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Hydrogen has the highest combustion energy per pound relative to any other fuel, meaning it is more efficient on a weight basis than fuels used currently. Hydrogen offers 2-3 times more energy than most other common fuels. It combines readily with oxygen, releasing considerable energy as heat.
Unlike carbon-based fuels, hydrogen produces no harmful by-products upon combustion. Only energy and clean water are produced when hydrogen is combined with oxygen in a fuel cell.