I teach a high school Intro to Ag class, with Freshman. So this may or may not work, but I have a lot of great lesson plans if you want something specific. I have included one of my favorite ones on Agriculture Around the World. Hope this helps, if you need more just ask!
I usually would do the World Hunger Problem lesson first (U1 L1, U1L1PP) then I have them do the Agriculture Around the World project. When they present their projects you have them fill out the worksheet (ws) with facts from the other students projects.
I found your project and am interested if you have changed it much since your posting in 2008? I am planning to do something very similar with my AFNR class as an addition to the CASE-AFNR curriculum. Please let me know if you have made changes.