We have several periods of agricultural development.
Neolithic humans shifted from hunting food gathering to
husbandry in established
towns, Thousands of years later
Britain developed agriculture which concentrated on
better land use, crop rotation and better husbandry.
Within the last century scientist using genetic
engineering, insect/pest control and industrialized
husbandry caused an explosion in per acre
production. With each stage the working conditions,
machine use and the income of the farmers, herders
and ranchers changed our world.