Most cars use Gasoline for power. Gasoline is a non-renewable resource. What will our cars use for energy when the gas runs out?
The sun and wind are two sources we can use for energy. These are called renewable resources. These are forms of energy that can be used over and over again and we don't have to worry about them running out.
Today, engineers are looking for ways to use renewable energy, like the sun and wind to power the things we use everyday.