This video gives a great presentation of all the waste that is associated with how we grow and supply food for our civilization:
http://www.ted.com/talks/tristram_stuart_the_global_food_waste_scandal.html
Summary: Wealthy nations produce a lot of extra food that doesn't get eaten. (for reasons like "it looks weird" or "it has a bruise on it")
The presenter also highlights how this unsightly food could be fed to pigs, and at least be turned into pork products.
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