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Hydrogen fuel still results in pollution because _____. hydrogen is converted into carbon dioxide electricity is required to produce the hydrogen fuel used hydrogen creates ozone it contaminates water sources

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pbzepplin
The answer is B: electricity is required to produce the hydrogen fuel. This could still be polluting because much electricity is produced using fossil fuels. However, this question is a bit misleading. If electricity used to manufacture hydrogen is sourced from renewable energy, such as hydropower, solar or wind energy, then hydrogen power in turn is also not polluting.
Your answer would be electricity is required to produce the hydrogen fuel. 

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