Source of energy Consumption of fuel could deplete crude oil reserves by the year 2060. So people have to think about alternatives. Humans have already started to use bio-diesel fuel. Bio-diesel could be made from soybeans oil or other vegetable oil that not elementally different from soybeans oil. Diesel engines can take up 20 percents soy in their soy-diesel blend. Maybe in the future, we'll see the extinction of the fossil-fueled vehicle. Bio-diesel is a more stable source of energy than petroleum cause it less contaminates our environment (air and water).