This collection reviews the alternatives currently under consideration for manufacturing vehicles with lower carbon emissions than current internal combustion engine designs. The 22 chapters discuss renewable liquid and gaseous fuels for improving the environmental performance of internal combustion engines, powertrain development for heavy-duty vehicles, advanced engine materials, flywheel energy storage, hydraulic and pneumatic hybrid powertrains, regenerative braking, and electric hybrid vehicles. The volume fails to address the environmental impacts of electrical power plants and hybrid battery disposal.