Ethanol is renewable.
It is derived from virtually inexhaustible energy sources such as grain, crops, and plant matter such as agricultural residue. Ethanol produces minimal pollution and significantly reduces harmful exhaust emissions. Ethanol does not come from fossil fuels, so manufacturing does not add to the carbon dioxide in the atmosphere. Increases in carbon dioxide make the greenhouse effect worse. Ethanol provides high octane for relatively little cost, providing a low-cost alternative to fuels which use harmful additives to achieve high octane.