All of the foregoing technological advances have been critically dependent on the availability of an abundant and economic supply of fossil fuels including diesel fuel for on-farm tractors and self-propelled machines; and natural gas, heavy fuel oil and coal for off-farm electricity generation.
Early tractor designs were based on the concept of substituting mechanical pulling or draft power for the draft animal classically associated with pulling plows through the soil, operating reaper and binder machines through fields of corn, or mowers through fields of grass. Cumbersome steam powered engines were soon to be replaced by the more energy efficient and compact internal combustion engine.

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All of the foregoing technological advances have been critically dependent on the availability of an abundant and economic supply of fossil fuels including diesel fuel for on-farm tractors and self-propelled machines; and natural gas, heavy fuel oil and coal for off-farm electricity generation.
Early tractor designs were based on the concept of substituting mechanical pulling or draft power for the draft animal classically associated with pulling plows through the soil, operating reaper and binder machines through fields of corn, or mowers through fields of grass. Cumbersome steam powered engines were soon to be replaced by the more energy efficient and compact internal combustion engine.

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