Solar-powered cars use sunlight as fuel.
In Japan, hybrid cars combining a gasoline engine and an electric motor have become very popular.
Japan has also been studying very hard about solar vehicles and now has one of the most advanced technologies in the world.
Solar cars using sunlight are very friendly to the earth, while people say gasoline-fueled cars discharge CO2 and make the earth's air warmer than it should.
Solar models are still at the experimental stage but before long Japan's high technology may be able to produce commercially viable solar vehicles.