> If you used a horse instead of a tractor you would only require 1/3rd of your farm..

Do you have a substantive reference for this data point?

I can't say when, but we will go back to using horses eventually, especially if we don't conserve fuel sources by planning the weaning away from the ridiculous squandering due to automobility, which is a twentieth century historical flash in the plan. The way things are going, I foresee a terrible crash with respect to work and transportation needs currently subsidized by oil and other energy resources.

We probably should be Planning the conservation and population growth of draft animals so that we will not be left stranded with only human power to run our farms and deliver our goods. Such planning should be in the context of a larger plan that will make demand-side management the keystone, that is rebuilding our 20th century suburbs to make them walkable. We need to build and stock economic/community centers in all neighborhoods where all residents can get the things we need within walking distance. Let's bring the goods and services to the people rather than all this wasteful shopping behavior.

The assumption of automobility is absurd within a historical perspective.