With regard to the introduction of new fuel and vehicle types, GHG emissions can be addressed through the introduction of new fuels (e.g., electricity, biofuels, hydrogen, etc.), different “end-use” technologies (e.g., better or different “prime mover” engines and motors, energy storage systems, etc.), or a combination of both fuel and vehicle changes. For example, more efficient hybrid vehicles can be developed that burn gasoline, but the vehicles could also be designed to burn a fuel mainly composed of ethanol, biodiesel, natural gas, or hydrogen.