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Hydrogen has been used as a rocket fuel ...

Hydrogen has been used as a rocket fuel . Would you consider it a cleaner fuel than CNG ? Why or why not ?

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Hydrogen is a cleaner fuel than CNG because the burning of hydrogen produces only water, which is completely harmless. The burning of CNG produces carbon dioxide and water . This `CO_2` can produce greenhouse effect in the atmosphere and lead to the excessive of the environment in thelong- run.
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