1. U.S. Global greenhouse gas emissions data;EPA,2017
2. Transitions to alternative vehicles and fuels;National Research Council,2013
3. Cost, effectiveness and deployment of fuel economy technologies for light-duty vehicles;National Research Council,2015
4. Barriers of scaling-up fuel cells: cost, durability and reliability;Wang;Energy,2015
5. Executive order B-16–2012. State of California;Governor Edmund,2012