Biofuels are defined as liquid, gaseous, and solid fuels that are mostly produced from biomass. Biofuels are used for a variety of reasons, such as energy security, environmental protection, currency savings, and socioeconomic challenges specific to rural areas. Vegetable oils, biodiesel, biogas, biosynthetic gas, bioethanol, bio methanol, biodiesel, bio oil, bio char, and bio hydrogen are all examples of biofuels. The majority of conventional biofuels, such as ethanol from maize, wheat, or sugar beets and biodiesel from oil seeds, are made from well known agricultural food crops that require high quality agricultural land to cultivate. An alternative or supplement for gasoline is bioethanol. Utilizing bio syngas derived from the steam reforming of biomass, bioethanol may be created from biomass. The recovery of bio methanol is much simpler than that of bioethanol from biomass. It is costly to purify the ethanol during recovery since it forms an azeotrope with water. First generation biofuel feedstock sources such as sugarcane, cereal grains, and oilseeds for biodiesel and biobutanol directly compete with the demands for global food security. Gene suppression can stop the intensive usage of oilseed rape from releasing large amounts of methyl bromide into the atmosphere. The cultivation of lignocellulosic crops or the waste from straw will be the source of second generation bioethanol/biobutanol biofuels. These might be largely substituted by transgenically lowering or altering lignin concentration and upregulating cellulose production in place of the heat and acid now needed to remove lignin. Transgenically modifying silicon content may be used to lower nonperceptible silicon emissions from burning.
