When it comes to car fuel, most people imagine diesel, gasoline or electricity. However, there can be many more types of fuel for cars. At present, the most important goal is to protect the environment, so we are looking for environmentally friendly ways to power the car. Cars powered by hydrogen, used vegetable oil, solar cells or even wind already exist. There are many alternative energy sources for cars, but not every such source is suitable. Below you can see a ranking of the most promising alternative energy sources through infographics from the Carrentals.com portal.