Currently there are two major types of biofuel. One is bioethanol, made from such crops as sugarcane, corn, sugar beet and wheat; the other is biodiesel, synthesized from seeds of plants such as rape, sunflowers, soybeans and palm.
目前全球生質燃料分為兩大類，一是由玉米、甜菜、甘蔗、小麥等製成的「生質酒精」（乙醇）；另一種則是榨取自油菜、向日葵、大豆、棕櫚等籽實的「生質柴油」。