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We could be arguing semantics...
http://rationalwiki.org/wiki/World_food_shortage
The trouble is less about the total amount of food (which there’s been enough of all along), and more about getting it where it needs to be. The standard mechanism is economics and politics. But these had suitable cracks in them for speculators to run wild.[1]
What you're citing is a lot of hokum. There are no "food speculators" and "food speculators" aren't what keeps sub-Saharan Africa from enjoying the same rapid improvements as South America, Central, and Far-East Asia.