Here is a very clear, farmer-angle view of a few of the problems inherent in our modern food system. It is matter-of-fact, agronomically sound, and lacking in the heavy-handed ideology and dogma that often creep into debates on sustainable food.
This excerpt is from a book by journalist Beverly Bell called Harvesting Justice. I haven't read it yet, but I plan to. If you want an idea of what the book's about, and a brief, concise description of the concept of food sovereignty, read this blog.
Another book she's linked to on her website is about striving for a zero-waste regimen, which is to say eliminating landfills and incineration for garbage by reducing and recycling the waste generated by our modern lifestyle. Again, I haven't read it, but it's on my queue.