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We are on the precipice of a global food crisis. The math is simple and staggering: we need to produce at least 50% more food to feed 9 billion people by 2050, but are currently capped by resource limitations, environmental contamination, and agricultural decline. At MIT, Caleb Harper, an architect turned urban farmer, is working to reverse the tide by revolutionizing agriculture as we know it. Subscribe to HuffPost today: http://goo.gl/xW6HG Get More HuffPost Read: http://www.huffingtonpost.com/ Like: https://www.facebook.com/HuffingtonPost Follow: https://twitter.com/HuffingtonPost