Here is an excellent presentation which discusses what it will take to provide a sustainable source of food for the growing world population. 
We have a rapidly growing population, we have close to 1 billion people who are underfed, and we're losing farms and soil at a rapid pace. We contribute to global warming by tranporting food across the globe. 
The presenation concludes with a vision for the future and some positive steps we all can take to move the world closer to providing a sustainable source of food for the world. 
 
 
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