Advantages:
1. If the hydrogen comes from a renewable resource, generating energy this way is renewable. (For example, water is the product, so by decomposing the product you have a renewable source of hydrogen).
2. As the only product is water, it does not produce pollution which contributes to global warming, so is cleaner than fossil fuels
3. On spacecraft, fuel cells are often used to generate electricity, and can also produce water for the astronaughts to drink
4. Hydrogen fuel cells are lightweight and compact, with no moving parts.
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