Biofuels are a renewable energy source in that they are created from plants that can be regrown each year. Biofuels also do not require many changes(if any) in cars and other places of use to be utilized. Some consider the use of biofuels as carbon neutral since the carbon produced when burning them is offset by the carbon consumed by the plants they came from. In the United States, biofuels can help reduce the dependence on foreign oils, which fluctuate in price rapidly. Biofuels may help to buffer against the change.