A hybrid electric vehicle is a vehicle that has both an internal combustion engine and an electric motor inside.
Fuel is produced by harvesting fossil fuels from the ground. It is then ground up and made into oil and shipped wherever it's needed
The Toyota Prius is one hybrid electric vehicle. So is the Chevrolet Volt.
These vehicles use less fuel, so the cost of filling up is a lot lower for the owners of these vehicles. They are also financially beneficial because they save on brakes, oil changes, and maintenance. The environmental impact includes fewer emissions into the atmosphere and less consumption of foreign oil. When we use less foreign oil, we save on the costs of shipping and using fossil fuels to run the tankers and trucks to get the fuel from there to here.
See previous paragraph
Not everyone can afford an electric vehicle, so they keep using their standard car. Also, not everyone is sold on the idea of a hybrid vehicle. It takes a lot of energy and fossil fuels to make one car, plus they just cost a lot to produce. Usually the generation II or III version of a hybrid is when an auto maker starts to see a profit; when the first generation of the Volt came out Chevy wasn't making that much money because the Volt cost a lot to make