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Locally they are zero emission. The emissions are produced somewhere else so that the air quality in the city gets better. You can make fuel cells real zero emission if you use water and renewable energies to produce hydrogen. A second way is producing Methanol from the atmosphere with renewable energy and using it in a fuel cell. The fuel cell releases CO2 but not more the used to produce Methanol: <a href="https://serenergy.com/the-first-methanol-fuel-cell-powered-vessel-in-germany-is-now-sailing-the-waters-of-lake-baldeneysee/">https://serenergy.com/the-first-methanol-fuel-cell-powered-vessel-in-germany-is-now-sailing-the-waters-of-lake-baldeneysee/</a> Producing Hydrogen from hydrocarbons will release CO2. There are ways to make fuel cells zero emission. Hydrogen production could be used to buffer renewable energy in times of low demand. Regards, Volker
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