Ethanol is a fuel source derived from sugar cane, potatoes, manioc or corn. Today, most cars on the road in the U.S. run on gasoline blended with up to 10% ethanol. In an effort to find alternative clean-burning fuel sources, ethanol has emerged as a potential option. Brazil imports cars that run entirely on ethanol; however, cars manufactured for the U.S. market don’t have engines that can function with pure ethanol fuel and there are environmental concerns regarding the area needed to grow the crops required for the fuel.