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Have you ever wondered by how much CO2 emissions can be reduced by
running cars electrically or with hydrogen as fuel? This Brief
provides a quantitative answer to this question using the example
of the combined road traffic in Spain. The authors calculate the
resulting greenhouse gas (GHG) emissions for the production of
hydrogen gas or the required electricity and installing and
maintaining the necessary infrastructure. In this way, they can
compare with the GHG emissions in the present situation of oil
fueled cars. Using different scenarios, they obtain an assessment
how much 'greener' the electric or hydrogen cars can get.The method
described in this Brief is scalable and readily adaptable to other
countries. It can thus be used for investigating sensible
approaches and developing recommendations for a conversion. As
expected, the results depend strongly on the production scenarios
for hydrogen or electricity production. The wrong choice can even
result in increased GHG emissions. A proper choice of the roadmap
toward a more sustainable and greener future is of greatest
importance - the results described in this Brief can serve as a
valuable and useful guide on our way.
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