Garbage and agricultural, industrial, and food waste can be used to create a variety of biofuels. Biodiesel can be produced from leftover used restaurant fryer oil, or any oil waste product, such as waste from slaughterhouses. It also has the advantage of being a rather simple production process suitable for large or small scale. Small and midsized operations like Clean Energy Biofuels, located in Atlanta, Georgia, and Knoxville, Tennessee, serve the local community by picking up waste oil from local restaurants, converting it to biodiesel, and then selling it to local users.