In this "petrochemical food chain," the cultivation of corn requires huge inputs of petroleum derivatives like chemical fertilizer and pesticide. Tractors consume huge amounts of diesel fuel and lubricants, and the whole system requires massive irrigation works. On top of that, don't forget long distance trucking and shipping.
在這個「石化食物鏈」中，玉米栽植需要大量的化肥和殺蟲劑等化石衍生製品、需要耗油量（柴油、潤滑油）極大的牽引機、需要規模龐大耗能的灌溉系統，加上整個過程中無數次往往返返的長程運輸。