As countries race to reduce emissions and mitigate climate change, the debate on green vehicles often focuses on fuel efficiency and alternative fuels, such as electricity and hydrogen. A common idea is that the faster the transition is, the better it is for the environment.As countries race to reduce emissions and mitigate climate change, the debate on green vehicles often focuses on fuel efficiency and alternative fuels, such as electricity and hydrogen. A common idea is that the faster the transition is, the better it is for the environment.