[disposablezero]

A few people growing a massive amount of genetically-identical (GM) grain in a narrow band of arable land pilles risk up like a Jenga game. In the US, the median climate models suggest the majority of intensively-cultivated land and surrounding areas will experience significant desertification.

Plus, cities are filled with mostly knowledge and service specialists whom depend almost entirely on massive quantities of goods and food produced in factories and rural areas.