Biofuels contain energy from organisms. There are many forms of biofuels, including trash, animal waste, plants and their products, and wood. Some biofuel uses are more sustainable than others, partic...Biofuels contain energy from organisms. There are many forms of biofuels, including trash, animal waste, plants and their products, and wood. Some biofuel uses are more sustainable than others, particularly those that use materials that would otherwise be discarded. Biofuels are carbon neutral, but burning them does pollute the air.
