Light-duty vehicles contribute 61% of the greenhouse gasses emitted in the US. To meet the goal of an 80% in greenhouse gas emissions by 2050, a systematic approach is needed according to the MRS Energy & Sustainability review on the Implications of sustainability for the United States light-duty transportation sector. This includes better fuel efficiency, extensive use of biofuels, use of electric vehicles powered using sustainable energy, and hydrogen powered vehicles where hydrogen is produced from low carbon sources.