there are many alternatives, one being vegetable oil, hemp and bio fuels

Edit bmdunster: Source - (http://environment.about.com/od/fossilfuels/tp/top_alt_fuels.htm)

1. Ethanol as an Alternative Fuel.Ethanol is an alcohol-based alternative fuel that is made by fermenting and distilling crops such as corn, barley or wheat. Ethanol can be blended with gasoline to increase octane levels and improve emissions quality. 2. Natural Gas as an Alternative FuelNatural gas is an alternative fuel that burns clean and is already widely available to people in many countries through utilities that provide natural gas to homes and businesses. When used in natural gas vehicles-cars and trucks with specially designed engines-natural gas produces far fewer harmful emissions than gasoline or diesel. 3. Electricity as an Alternative FuelElectricity can be used as a transportation alternative fuel for battery-powered electric and fuel-cell vehicles. Battery powered electric vehicles store power in batteries that are recharged by plugging the vehicle into a standard electrical source. Fuel-cell vehicles run on electricity that is produced through an electrochemical reaction that occurs when hydrogen and oxygen are combined. Fuel cells produce electricity without combustion or pollution. 4. Hydrogen as an Alternative FuelHydrogen can be mixed with natural gas to create an alternative fuel for vehicles that use certain types of internal combustion engines. Hydrogen is also used in fuel-cell vehicles that run on electricity produced by the petrochemical reaction that occurs when hydrogen and oxygen are combined in the fuel "stack." 5. Propane as an Alternative FuelPropane-also called liquefied petroleum gas or LPG-is a byproduct of natural gas processing and crude oil refining. Already widely used as a fuel for cooking and heating, propane is also a popular alternative fuel for vehicles. Propane produces fewer emissions than gasoline, and there is also a highly developed infrastructure for propane transport, storage and distribution. 6. Biodiesel as an Alternative FuelBiodiesel is an alternative fuel based on vegetable oils or animal fats, even those recycled after restaurants have used them for cooking. Vehicle engines can be converted to burn biodiesel in its pure form, and biodiesel can also be blended with petroleum diesel and used in unmodified engines. Biodiesel is safe, biodegradable, reduces air pollutants associated with vehicle emissions, such as particulate matter, carbon monoxide and hydrocarbons. 7. Methanol as an Alternative FuelMethanol, also known as wood alcohol, can be used as an alternative fuel in flexible fuel vehicles that are designed to run on M85, a blend of 85 percent methanol and 15 percent gasoline, but automakers are no longer manufacturing methanol-powered vehicles. Methanol could become an important alternative fuel in the future, however, as a source of the hydrogen needed to power fuel-cell vehicles. 8. P-Series Fuels as Alternative FuelsP-Series fuels are a blend of ethanol, natural gas liquids and methyltetrahydrofuran (MeTHF), a co-solvent derived from biomass. P-Series fuels are clear, high-octane alternative fuels that can be used in flexible fuel vehicles. P-Series fuels can be used alone or mixed with gasoline in any ratio by simply adding it to the tank.

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