Solar powered cars
The first set of solar powered cars was introduced in July of 2004 and hit the market with a boom. The popularity was extensive as these cars were said to be relatively inexpensive, and ran off of batteries. They also did not emit carbon monoxide into the air like tradition gas powered car do and that really perked the interest of many environmentalists all over the world. The solar powered cars popularity has since cooled off a bit as there are some restrictions as opposed to the cars that we commonly see on the road.
Solar powered cars run off of batteries that are charged from radiant heat from the sun, although they can only run for a stretch of about 100 miles on a full charge before they become dormant and need recharging. When compared to a gasoline powered car, that can go that same distance on just a few gallons of gas that can be put into the car in a matter of minutes, making it more convenient for drivers. Also, these solar power cars can have many 
batteries on board weighing in excess of 1,000 pounds where as a gas powered car can hold enough gas to go the equivalent distance and only weigh a mere 20 to 30 pounds. These solar powered cars are also restricted in the speeds that they can achieve, depending on battery strength, which is another downfall.
The benefits of using solar powered cars are the simple fact that you will not have gasoline charges to keep your car running, and they are also environmentally friendly as well. Gas powered cars can emit the carbon monoxide, which is said to be responsible for global warming, and make them harmful for not only the environment, but all the people that are breathing the same air as well.
