- Biodiesel is made from vegetable oil or animal fats and is designed for use in diesel engines. The benefit of biodiesel is that it can be mixed with petroleum at any degree. It has also been identified by the U.S. Environmental Protection Agency as a legal option that can be sold and distributed in the country.
- Ethanol, also known as ethyl alcohol is made from fermented corn, grains or waste materials. It can also be chemically extracted from ethylene through a method of hydration. Ethanol is generally mixed with traditional gasoline.
- Electricity can be used as a substitute for other types of fuels. Electrons are charged into a battery that can power a vehicle or other appliance. The main bonus of this method is that it produces no carbon emissions.
- As the most abundant element on earth, hydrogen can be extracted from a wide range of compounds. Hydrogen can either be burnt within an internal combustion engine or used with fuel cells that chemically alter its form.
- Natural gas can either be harvested from natural gas fields or culled as a by-product of coal mining and oil drilling. As a fuel, it can be processed into two forms: compressed natural gas and liquefied natural gas. It's used mostly for large trucks and buses.
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