@ontploffing Tractors, trucks, and trains run on diesel. (Ships use fossil carbon fuels, but not usually diesel.) Fertilizers are synthesized from fossil carbon inputs.
The customary stylized fact has ten tonnes of fossil carbon per tonne of food.
Trying to feed people without mechanized agriculture is a problem we have to solve because we're going to lose agriculture to an unstable climate. It is certainly not solved today. "Local hand tillage" does not suffice in several ways.
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