They worked out four-crop rotation during the agrarian revolution in the 18th century, they haven’t let fields lie fallow since they worked out how to rejuvenate the soil with crops like turnips that could become horse feed…
Pre-Columbian Meso-Americans were already exploiting nitrogen fixing bacteria with the milpa (corn, beans, squash). Anyway the point is if your yield is dependent on how much fertilizer you produce industrially then the sky is the limit for how much coal to burn.
They worked out four-crop rotation during the agrarian revolution in the 18th century, they haven’t let fields lie fallow since they worked out how to rejuvenate the soil with crops like turnips that could become horse feed…
Pre-Columbian Meso-Americans were already exploiting nitrogen fixing bacteria with the milpa (corn, beans, squash). Anyway the point is if your yield is dependent on how much fertilizer you produce industrially then the sky is the limit for how much coal to burn.