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They say that the exhaust from a hydrogen fuel cell powered bus tastes a bit like distilled water. That's because it is water. Fuel cells using pure hydrogen do not emit any air pollutants or greenhouse gases, only water vapor. Hydrogen fuel cells promise to power our vehicles, homes and offices more efficiently and will be less harmful to the environment than traditional energy sources. What is the state of this technology and what stands in our way of using this clean, renewable energy resource?