While autonomous driving is a major theme at the International CES gadget show, cars that use futuristic sources of energy are potentially much closer on the horizon.
Ford Motor Co. showed off a prototype solar hybrid car called the C-MAX Solar Energi, which has a gas engine along with rooftop solar panels that also power the engine. The car is designed to park under a 15-foot-tall carport made of a thin magnifying glass called a Fresnel lens that concentrates the sun's rays onto the panel to efficiently generate electricity. The carport isn't portable. So the car has to stop and recharge.
