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Petroleum will not be a source of fuel for much longer. What are we going to do when it runs out? I will explain alternative sources for fuel or energy for vehicles that are already in use or that have been proposed. With each source I will discuss the pros and then the cons of it. The first alternative fuel source I will discuss is Biodiesel. Biodiesel a clean burning alternative fuel, produced from domestic, renewable resources. Biodiesel contains no petroleum, but it can be blended at any level with petroleum diesel to create a biodiesel blend. It can be used in compression-ignition (diesel) engines with little or no modifications. Biodiesel is simple to use, biodegradable, nontoxic, and essentially free of sulfur and aromatics. Biodiesel is produced from any fat or oil such as soybean oil, through a refinery process called transesterification. This process is a reaction of the oil with an alcohol to remove the glycerin, which is a by-product of biodiesel production. Fuel-grade biodiesel must be produced