Bioethanol is a clean fuel used for combustion engines made from plant-based feedstocks. It produces considerably lower emissions on combustion and it only releases the same amount of carbon dioxide as plants bound while growing. Bioethanol is majorly produced from the sugar fermentation process, and rarely produced from the chemical reaction between ethylene and steam. The main source of sugar required to produce ethanol comes from fuel or energy crops. These fuel crops are grown specifically for energy use and include maize, corn and wheat crops, waste straw, willow, sawdust, reed canary grass, cord grasses, Jerusalem artichoke, Myscanthus and sorghum plants.