The automotive industry is currently at the centre of a critical debate concerning the transition towards sustainable and climate-neutral motorised mobility. This M.Sc. thesis focuses on developing a synthetic model to assess the Global Warming Potential (GWP) of light-duty vehicles, to support local administrations in promoting low-impact mobility. This approach results quite new in literature, according to the state of the art. The GWP emissions have been evaluated for nine vehicles with low or zero CO2 emissions. The effect of two production scenarios, i.e., Europe and extra-Europe, has been analysed to assess the environmental impacts of the same vehicle under different energy mixes.