Seriously?
I can assure you that you need at least 90,000 square feet of land to produce enough for one person. That is only like two acres per person. Something tells me you aren't a farmer. And I guess you weren't aware that at least 915,000,000 per year die from starvation-caused illness and disease.
I remove all references because they are ugly. Would you like me to break out studies from various reputable Ivy League schools, or do you want me to just stick to the UN references, and find the pages for you?