The world diet is increasingly dependent on a handful of staple crops such as wheat, rice and maize. Check out this recent study published in the Proceedings of the National Academy of Sciences: http://www.pnas.org/content/111/11/4001.abstract Just like investing all of your life savings in the stock of a single company, a homogeneous food portfolio has a number of risks. Can you think of reasons for why our global food supply is not very diverse? However, things are not just all rice and potatoes. Check out this BBC story about a new crop being developed as an alternative source for the omega-3 fatty acids found in fish oils. http://www.bbc.com/news/science-environment-34464582
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