The Centre for Agroecology and Sustainable Food Systems at UC Santa Cruz has some “instructional resources” on sustainable agriculture online. That’s mainly a course outline and references. There is stuff on agricultural biodiversity in the course outline, but somehow you don’t get the idea – or at least I didn’t – that this is something that is central to sustainability. More of an added benefit, or a fortuitous side-effect. See if you get the same impression.