Hybrid cars can use two or more power sources to make the vehicle move. It includes the internal engine and in addition uses one or multiple electric motors. The entire concept of hybrid vehicles has been invented with the idea of saving more petrol. The power sources used by these hybrid cars include electricity, solar energy, compressed air, radio waves, hydrogen, liquid nitrogen, coal, wood or other combustible substances and the waste heat generated from the internal engine.

The best thing about hybrid cars is probably the low emission rates from these vehicles. Most of the times, natural resources are used that are either recycled or cause minimal pollution. The emission rates are most of the times within or even below than the acceptable levels given by the Environmental Protection Agency, that is within 5.5 metric tons of Carbon dioxide. In addition to these, hybrid cars also reduce the amount of smog forming agents in the atmosphere.