I love this ST1 Bioethanol animation video because it discusses "dispersed bioethanol production." This concept shows the importance of having small bioethanol plants set up near bakeries, breweries, dairy factories, and food factories. The waste from these factories can be used for bioethanol production, through fermentation, instead of being sent to the landfill. This process reduces the transportation of waste from point A (bakery) to point B (ethanol plant).
Check it out: http://www.youtube.com/watch?v=kqfW0VmONXc&feature=related